internet goes out every night since it began getting colder

its been going on for month everynight at the same time around 2-3am and doesnt go back to normal until like 9am. i contacted xfinity agents many time asking them to check my modem logs but all i hear back is they are working on it??? A tech hasnt came yet because the issues occurs late night so during the day when they come of course they wont find anything wrong. what can i do??? i replaces all wires on my end. heres what the xfinity app looks like everynight