Wired Doorbell Pro Install and Transformer Problems

I’ve had the ‘video doorbell pro’ in use for about 7 years (using ring chimes) with few problems. Last year the button cracked but it still worked okay. Fast forward to July 17th. Out of the blue the mechanical doorbell chime (that I don’t use) went ‘dong’, started buzzing and smelled like burning wires. I took the cover off and saw that the ‘front’ wire had become loose somehow. I turned off the power and figured it must be the transformer. Luckily (I thought), the week before I had purchased the ‘wired doorbell pro’ on ‘prime day’ and it was being delivered in a couple days. I’d just get a new transformer and wait. Fast forward to today. I have now gone through 4 transformers (24v-40va, 24v-40va, 16vac-30va, 16vac-30va). I’ve tried bypassing the chime box, using the power pack with the chime box, and no matter what I still cannot get the wired doorbell pro working. My last attempt was installing a new chime box (just in case) with a new transformer and the result was the same dong, buzzing and hot burning wire smell that started it all. I’ve tested everything with a multimeter and have continuity but nothing is working as it should. I just need to know why, after 7 years everything is failing. Is the camera bad, the power pack, what is it??? Please help.