I'd like to reach out to the OP here.  I'm in a unique position here to possibly help get some clarity on this situation.  I'm an alt coin miner and I just happen to also be a Verizon Wireless technician that works on cell towers as well.  I've had to hunt down my fair share of interference over the years & I'd like to be able to reach out to my co-workers that you spoke with to find out the symptoms of the issue they were working on.