Tell us what equipment you have, how it's connected, the plan to which you are subscribed, and be more specific about the problem.
If you have access to the modem's signal levels page and event log please post them as well. Access will depend on the modem you have.
hmmm.... downstream SnR values just under 38....
Technically, it should not be a problem.... just a bit lower than I am used to seeing myself.
Also some repeating partial service entries in the log.
Gets me thinking some noise may be creeping in somewhere, just enough to knock things off kilter here and there.
Have you checked for the usual loose/corroded connctions, compromised cables, overheating devices (don't overlook the power supply... it can inject a hum if it is failing)?