Remarks
Suspend working. No freezes at all. All USB ports working (USB2), no problems assigning any device to a VM (USB is slow, noticeable when copying files); dedicated GPU working (sys-gui) and so on.
All in all pretty stable. I’ve been using it for more than 2 years. Never thought about switching back to the original BIOS.
Maybe your laptop wasn’t working well anymore from the start (?). 
It isn’t the fastest laptop out there (I’ve posted the time period for starting a VM somewhere in another thread) but it’s one of the cheapest (if you’re lucky) to be compatible with Qubes 4.0 and 4.1, it has no ME or PSP and with 16GB RAM it works well enough for me. I’ve put 2 SSDs inside and I use a Yubikey for U2F and to secure my keepass.
The only major problem I am having with this laptop is that the Qualcomm Ethernet controller is not working anymore above kernel 5.4.98. I am still hoping that a later kernel will solve the problem.