After some time of testing, I have to admit that my SanDisk (Extreme microSDXC UHS-I A2, 128 GB) fell back to its previous bad habits, including the I/O errors. In fact, it is more probable that the error persisted all the time and I just didn’t recognize it with my use pattern. As reported elsewhere (Fp4 and SD card - #5 by F.Sowa), my BugReport folder is also full of those 0 byte txt files indicating some sort of storage error and larger files won’t copy (anymore). So formatting the SD card in another phone as suggested by @Chris_R may not be the ultimate solution, I’m afraid. I’ll chance my luck with a Samsung card now. Has anybody contacted support yet? If not, I can take care of that.
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