Ref code s0a00 and status code 225 on some HD channels

Some of the HD channels are not working. Showing "one moment please... ref code s0a00 " on the DVR and "status code 225" on the set top boxes. Usually Fox, ABC, MSNBC, and few channels I don't watch regularly. Really messing up my NFL games.

I called support 3 times and performed the usual troubleshooting. The first agent said she tried everything, restart the boxes and system refresh. Didn't fix the issue and said she will send the issue to the "advanced tech" team. The channels came back the next day.

Then stopped again a day later. Called again and the 2nd agent fixed the issue by sending a high frequency signal. But started failing again before I went to bed.

Called again and this time the agent said she sent the signal and didn't work. Also said because it is not a total outage and due to the pandemic, they can't send anyone out and I just have to watch the channels in SD.

Now the DVR is showing "hunt" on the front LCD panel once in awhile.

Does anyone have a clue how to fix the issue?

BTW: I checked all the connections, manually restarted the box by unplugging power and coax. Also I don't use any splitter and didn't change anything before this all started happening.