Is it using a compressor or is it thermoelectric? If it’s the latter, they sometimes need to be reset. They will usually have a control board that has a beeping alarm of some sort if that’s the case. You can reset by unplugging power from the board to the cooler while the unit is plugged into...
I do something similar, but attach to the wall with Velcro so I can take it with me. I also cut a “window” down the side of the tube so I could grab from there. I don’t recall the exact reason I did the window, but it was a later modification.
Did the same for cellulose insulation at HD. I miscalculated because the existing was deeper than I thought in a lot of places. I tried my hardest to get more bags up there - now I have something like 18 inches in some spots - but still came about 15 bags short of the 100 bag bulk price. They...