If that happens exactly on a weekly basis, it sounds like some sort of cron job.
Are you running some init.d scripts or set up a weekly maintenance routine with some third party app?
Backup your files, microSD card is failing. Same problem here, I have a Sony microSDHC 32G that is read only.
Yeah that's what I do because it works in the PC, with problems, but it works. For example, I try to copy all the files and folders at the same time but the transfer freezes, so I've got to go to properties, select the option check errors or sth like that, it fixes whatever it has to be fixed and it works OK again.
Which rom you were using when it started to fail?
Jonzalvo's AOSP Pure. No problems with laek's rom and another Chinese rom.
I've been using this ROM since it first came on the scene and have not had any SD card issues, so I suspect it may be a duff card?
Is there any pattern to when the corruption occurs - ie after any updates, or removal of software, or after running cleaning tools?
With this rom I've got installed it happened when I had Avira antivirus installed. I uninstalled it but I started to get the SD errors I mentioned randomlly. The last time my mobile suffered a SD card error was when I had some audio recorded and I tried to upload it to Dropbox and suddenly an SD error occured.
Haven't seen anybody else reporting this problem.
Perhaps it's a hardware problem?
Maybe, I don't know, but I only got this errors with Jonzalvos and AOSP Nitro A310 v3 repack