Intermittently losing internet for several minutes

I’m having an ongoing issue where my Arris G36 modem (running latest firmware) stays locked (solid blue DOCSIS 3.1 light), but my internet connection drops for 1–3 minutes at random times. After a brief period of no connectivity, the modem light briefly blinks green and then returns to solid blue, and internet resumes. This happens at irregular intervals.

A tech visit recently verified that my local signal levels are excellent — this is not a wiring or splitter issue. The modem logs show no consistent local errors, and the modem remains locked throughout the event.

Because this is recurring, and because the modem is not losing DOCSIS lock, I suspect a node-level issue or transient upstream SNR/CMTS problem.

Can a corporate Comcast agent please run an upstream SNR and node health check? I would like this checked before another truck roll is scheduled. Thank you.