are you using a heatsink or any cooling? is it inside a case? don’t put it in a case unless it has some kind of cooling it should have open air. the pi zero w is a low power device and pretty much can work without cooling just like the zero 2 w. the pi zero 2 w is only a little different in that it can get up to around 72 degrees C without cooling but its still safe and supposed to work at that temp even without throttling. although I would attach a heatsink at least just to keep its temps a little lower than normal. ah here I found a good link for you to get some information on the 2w. https://www.hackster.io/news/raspberry-pi-zero-2-w-review-hands-on-with-the-fastest-zero-ever-b85b155905a5#:~:text=Under%20a%20thermal%20stress%20test%20the%20board%20gets,anywhere%20near%20its%20throttle%20point.%20(📷%3A%20Gareth%20Halfacree)