I was going to say upstream congestion was the cause but Sunday would likely be worse then Monday. So this likely a RF signal issue which could be beyond your home. If a tech installed a booster is also a strong indication of a neighborhood issue.
Thanks for the reply. I agree it seems like something out of my control. Shaw support has given me the run around saying it's somehow my software or hardware but those are both 4+ hour tests, one with ZERO dropped frames and another with dropped frames every 10 seconds, and the only difference was the date. I'm feeling like outside of moving my only option is to switch ISP and see if it helps. Thanks again for the response Matt.
@cbohdan I checked into your signal and see the upstream is still a bit out of spec. It may be the coax outlet or connection from the street equipment if a technician has come out to replace some of the cables. Please reach out to technical support again so we can investigate further.