If 10.5.14 is good and 10.5.15 is bad, you could try a kernel bisection to find the change that caused the problem. I did a bisection a year ago for a kernel problem on my laptop.
Bisecting a bug — The Linux Kernel documentation (Finding patch that caused a bug)
1830150 – [BISECTED] Fedora 31 with kernel 5.6 does not wake up from suspend (Notes)
Before doing a kernel bisection, I made a backup to an external USB drive with rsync and I tested that my last Fedora live CD still booted, although I was lucky and never needed either one.
make binrpm-pkg made it easier because I could use dnf to install and remove test kernels.
It can also help to set installonly_limit=0 in /etc/dnf/dnf.conf to prevent dnf from purging old kernels.
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