Some bluray require firmware updates to keep reading newer discs.
Something like the PS4/5 would do this automatically, so you'd never realize that there was a change and is more likely to not run into situations like these... but then it'd be overkill in buying a PS4/5 just so you don't run into issues like firmware updates on a blu ray player.
It's possible there's a coincidence where both players blu ray lasers have borked (different than the DVD laser).
You'll have to basically diagnose each situation to nail down the specific situation and try and fix that (ie: Time and effort if fixable this way)... or look into a replacement player that doesn't have the issue (ie: Throw money at the issue).
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