Thanks Jake.
I figured this was not cell interference since practically all stations dropped when the temps dropped, hence new thread.
I bypassed the CM7777 pre-amp just to be sure it wasn't faulty when temps drop, but the symptom remains.
Interesting to note I've lost most H-VHF stations as well, or at least they are unwatchable...
The sun is out this morning, so I'll check it this afternoon if it warms up outside.