My ht 1100 has been doing the same thing, usually around 1-2 pm. I thought it may be outside heat temp. My modem doesn't feel hot but I turn it off for 30-60 minutes and system light and Internet comes back. I think yesterday it took longer.
This seems to have started after the modem did some kind of an upgrade on 7/13/17. The strange thing about this, the menu item in the Advanced Menu where I saw the upgrade is not available now that everything is working.
I'll pay more attention today, it has only been mildly irritating so far.
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I've got green check marks all the way across top to bottom for 48 hours in the diagnostics. I don't think it is anything I did but appears to be fixed.