Recordings failing

[Higgo]

Hi folks, 
I returned to NextPVR after giving Hauppage's WinTV (comes with the TV card) a run.
For the first five days all was well, but now virtually every recording fails with the following message:
"No errors, but no data delivered. This is usually because the device failed to lock a signal."
Log files attached.
 
Is there anything I can do to fix this?

Thanks in advance for any  advice you may be able to provide.

[sub]

There is no sign of any errors in there, but it doesn't look like it manages to lock onto a signal. Are you sure your antenna hasn't moved in the wind or something?