mythTV problem: frontend id : Error_Open

[steve_batten]

I have MythTV running on an HP Proliant under ubuntu 12
I have a sony playTV dual tuner unit plugged in and a digitalnow pcie quad tuner card.
They both seem to be erratic and go missing in action every so often.
When I go into the MythTV backend setup and open the tuners I see the frontend Id is "Error_Open" rather than Dibcom 7000 or the RTL tuner for the DNQ card.
Anyone have any ideas?

From the kernel log it looks like it is picking up all the tuners on boot.

Jun 28 17:49:36 steveserver kernel: [ 21.391697] DVB: registering adapter 0 frontend 0 (DiBcom 7000PC)...
Jun 28 17:49:36 steveserver kernel: [ 21.422803] RTL2832U check_tuner_type : FC0012 tuner on board...
Jun 28 17:49:36 steveserver kernel: [ 21.623551] DiB0070: successfully identified
Jun 28 17:49:36 steveserver kernel: [ 21.623560] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
Jun 28 17:49:36 steveserver kernel: [ 21.623720] DVB: registering new adapter (Sony PlayTV)
Jun 28 17:49:36 steveserver kernel: [ 21.789275] DVB: registering adapter 2 frontend 0 (DiBcom 7000PC)...
Jun 28 17:49:36 steveserver kernel: [ 22.001975] DVB: registering adapter 1 frontend 0 (Realtek DVB-T RTL2832)...
Jun 28 17:49:36 steveserver kernel: [ 22.002198] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:04.0/0000:02:00.0/0000:03:00.2/usb4/4-1/input/input2
Jun 28 17:49:36 steveserver kernel: [ 22.005435] dvb-usb: schedule remote query interval to 287 msecs.
Jun 28 17:49:36 steveserver kernel: [ 22.005446] dvb-usb: USB DVB-T Device successfully initialized and connected.
Jun 28 17:49:36 steveserver kernel: [ 22.005478] dvb-usb: found a 'USB DVB-T Device' in warm state.
Jun 28 17:49:36 steveserver kernel: [ 22.005492] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
Jun 28 17:49:36 steveserver kernel: [ 22.009667] DVB: registering new adapter (USB DVB-T Device)
Jun 28 17:49:36 steveserver kernel: [ 22.020758] DiB0070: successfully identified
Jun 28 17:49:36 steveserver kernel: [ 22.031105] RTL2832U usb_init_bulk_setting : USB2.0 HIGH SPEED (480Mb/s)
Jun 28 17:49:36 steveserver kernel: [ 22.048133] Registered IR keymap rc-dib0700-rc5
Jun 28 17:49:36 steveserver kernel: [ 22.048626] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:13.2/usb2/2-1/rc/rc0/input3
Jun 28 17:49:36 steveserver kernel: [ 22.048742] rc0: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:13.2/usb2/2-1/rc/rc0
Jun 28 17:49:36 steveserver kernel: [ 22.048981] dvb-usb: schedule remote query interval to 50 msecs.
Jun 28 17:49:36 steveserver kernel: [ 22.048990] dvb-usb: Sony PlayTV successfully initialized and connected.
Jun 28 17:49:36 steveserver kernel: [ 22.050984] dib0700: rc submit urb failed
Jun 28 17:49:36 steveserver kernel: [ 22.051196] usbcore: registered new interface driver dvb_usb_dib0700
Jun 28 17:49:36 steveserver kernel: [ 22.274391] RTL2832U check_tuner_type : FC0012 tuner on board...
Jun 28 17:49:36 steveserver kernel: [ 22.846452] DVB: registering adapter 3 frontend 0 (Realtek DVB-T RTL2832)...
Jun 28 17:49:36 steveserver kernel: [ 22.850162] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:04.0/0000:02:00.0/0000:03:00.2/usb4/4-2/input/input4
Jun 28 17:49:36 steveserver kernel: [ 22.851644] dvb-usb: schedule remote query interval to 287 msecs.
Jun 28 17:49:36 steveserver kernel: [ 22.851653] dvb-usb: USB DVB-T Device successfully initialized and connected.
Jun 28 17:49:36 steveserver kernel: [ 22.851685] dvb-usb: found a 'USB DVB-T Device' in warm state.
Jun 28 17:49:36 steveserver kernel: [ 22.851699] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
Jun 28 17:49:36 steveserver kernel: [ 22.854539] DVB: registering new adapter (USB DVB-T Device)
Jun 28 17:49:36 steveserver kernel: [ 22.876164] RTL2832U usb_init_bulk_setting : USB2.0 HIGH SPEED (480Mb/s)
Jun 28 17:49:36 steveserver kernel: [ 23.114251] RTL2832U check_tuner_type : FC0012 tuner on board...
Jun 28 17:49:36 steveserver kernel: [ 23.682415] DVB: registering adapter 4 frontend 0 (Realtek DVB-T RTL2832)...
Jun 28 17:49:36 steveserver kernel: [ 23.685665] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:04.0/0000:02:00.0/0000:03:00.2/usb4/4-3/input/input5
Jun 28 17:49:36 steveserver kernel: [ 23.685871] dvb-usb: schedule remote query interval to 287 msecs.
Jun 28 17:49:36 steveserver kernel: [ 23.685879] dvb-usb: USB DVB-T Device successfully initialized and connected.
Jun 28 17:49:36 steveserver kernel: [ 23.685907] dvb-usb: found a 'USB DVB-T Device' in warm state.
Jun 28 17:49:36 steveserver kernel: [ 23.685919] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
Jun 28 17:49:36 steveserver kernel: [ 23.687657] DVB: registering new adapter (USB DVB-T Device)
Jun 28 17:49:36 steveserver kernel: [ 23.707281] RTL2832U usb_init_bulk_setting : USB2.0 HIGH SPEED (480Mb/s)
Jun 28 17:49:36 steveserver kernel: [ 23.944575] RTL2832U check_tuner_type : FC0012 tuner on board...