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I've assigned a default ringtone and one other ringtone to my wife. She called me two days ago and the phone played the Galaxy SII ringtone. Next day, somebody else called me, and the same happened.

So, I assigned the ringtones again, but I was wondering if this happens often, does it happen to others, is there a reason it happened to me (did I do something wrong)...

Probably it's a bug. Last night, the OS updated itself, and the ringtones were not affected.

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I had similar issues when ringtones assign by themselves on 2 different HTC phones. I couldn't figure out the cause. So it might be a bug in the system. – slybloty Aug 3 '12 at 12:50
@slybloty me too! My Evo3d started weeks ago to "slightly change" ringtones and alarm sounds. And I have the last LEEDroid ROM. – Axeman Aug 9 '12 at 7:46

I don't know if it could be your case, but if your phone is connected to your computer with UMS (USB Mass Storage) enabled along having a custom ringtone stored on your SD card (/ringtones folder) instead of MTP this will give you this kind of problem.

The phone will use a default ringtone since it cannot access the SD card files, because the UMS mode requires exclusive access to the mass storage.

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When the phone rang, it wasn't connected, but I did connect some time before that (if I recall correctly). – GUI Junkie Aug 4 '12 at 1:12
Yesterday someone called me and I was connected with UMS, and the phone did play the Galaxy SII tone, so, you're right there. – GUI Junkie Aug 13 '12 at 15:49

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