Hilariously(!) at one point the Panasonic player popped up a system warning that I'd never seen before: "copyright violation". Is it a copyright violation to sell people awful quality discs that self-terminate after barely a decade? It certainly should be. But I imagine the damage just made the player mistakenly think it was a bootleg copy for a moment (it's not).
The same thing happened to me near the end of the main series of Yumeiro Patissiere (as in the second of the two discs somewhere between episode 46 and episode 50) on my Maiden Japan/Sentai Filmworks SD-BD! Hopefully, it doesn't mean that disc is damaged - I only just bought the set a few months ago :< Though that said I would buy a proper full HD BD of the series as I really enjoyed it, especially if they dubbed it for such a rerelease. Hopefully one day. But also would be nice if my SD-BD hasn't already started to malfunction... I wondered if the player was also malfunctioning in its modified multi-region playback capabilities but I guess there's no way to know unless similar things happen repeatedly with other discs (which thankfully has not been an issue so far).