SB8200 and SB6190 cannot bond to any upstream channels...

SB8200 and SB6190 cannot bond to any upstream channels for the last week and drops signal constantly - - 5-6 times per day

I have tried changing out coaxial, factory resetting both devices, SNR is (35-40), signal strength is 10.xx db; I work from home and am seriously about to lose my mind.  I can't be the only one who is experiencing this constant signal drop.  any suggestions?  I use an attenuator and have also recently replaced a splitter between street connection and cable modem connection.  I have tried without the attenuator and without the splitter as well.  So so so so frustrating.