I really wish folks would read this entire thread. All of these answers are here. This thread keeps getting the same questions/answers over and over and its all in here.
1 - Saying it freezes and restarts helps nothing. You need the text of the panic. There are multiple panics that have different issues.
2 - The panic with the text "Powerplay failed to resume" or "Powerplay failed to initialize" are hardware issues and you WILL need to return it to Apple. There is absolutely no software fix for this whatsoever. Apple is aware of the issue and they have stated this is caused by a hardware anomaly.
3 - The above panic is able to be attained by using Geekbench 5 and running the Intel Metal API test. It will panic almost every time. You can also get this from running any graphic intensive application. These are NOT random. If the graphics switches the GPU for ANY reason whatsoever, if you have the problem it will panic.
4 - Hardware from November-February seems to have the issue. Hardware from March forward seems to not have the problems. This does NOT mean when you bought it. Its the hardware manufacture date. Dig into this thread and there is a link to a website that will tell you your hardware build dates. If you had a LB replaced, then this won't work and you will need to use Coconut Battery (I believe its free). Look at Philux's posts for more info on that. Check that your LB is March or greater. Your second LB may have been an older one with the anomaly.
I had this problem and Apple replaced my machine with a 2020 March build (It all custom top-of-the-line). I have had only 1 bad magic panic on 10.15.3 and have not had one since 10.15.4. The machine appears to be very stable. I get no freezes or reboots.
If you are having freezes, GPU panics etc, DO NOT wait for Apple to open its stores. Call Apple and have them ship you a box. It goes right to their repair facility. They are happy to support you over the phone and do it this way. In fact they encourage it during the quarantine. If they are not fixing it, then there are other ways to get it fixed by Apple. There is a thread over at MacRumors on the 16" GPU panic that explains that process. It is not something I am allowed to post here due to rules for these forums...I wish that I could...sorry.
Don't wait and hope. This problem gets worse. You need a hardware replacement.