Nighthawk MR1100 overheating and warranty

MR1100 purchased in November 2021 started to shut off due to non-charging in July 2022.  I thought it was the AC wall charger so I contacted Netgear for warranty replacement of just the wall charger.  My request was rejected because I didn't purchase it from an "authorized" vendor.  Nothing in the warranty requires an "authorized" vendor and it is clear that Netgear doesn't really support its warranties.  All that for a $5 part.  Great moments in customer relations.

So I bought a wall charger replacement.  For a while it was OK but the problem returned and now I'm realizing that overheating is causing the router to stop charging. It had nothing to do with the AC supply.  I've taken the cover off and stood it free on end and that might be working.  Also will replace the battery.  Router was expensive and works well with T-mobile when it is charged.