5G Home Internet nightly slow down

Same problem here. I had 5G Home Internet for 10 month now. It was great the first 8 month with consistent speeds of 250+ then the trouble started. My speeds now go down as low as 1.5 mbps and are consistently in the single digits during long stretches of the day. It does seem to be worse starting at about 6 PM but sometimes I have lousy speeds all day long. It usually gets better again late at night. I called customer service yesterday and after going through reboots and factory reset to exclude any issues at my end they told me that it's an issue at their end and they were going to refer it to engineering. The support person scheduled a follow up call with me in 3 days to see if the issue has been resolved. At least they didn't BS me and stated that it's a T-Mobile issue. That's still better than Xfinity. They had me try useless stuff over and over again and I would be without Internet for several hours during the day on a regular basis. So for now I'll wait and see if Tmobile can solve it.