I have a year-old Razr M (XT907), running Android 4.1.2. Loaded lots of apps with no problems for months. Then, I think after the last Android update, I began to get low-storage-space warnings. I deleted a bunch of apps, cleared the cache, deleted data, went back to the original version of apps, but kept getting the warnings. Now, it says I have 457MB of internal storage, but if I try to install even a very small (2MB) app, it says there's insufficient storage to do the install. Any ideas would be much appreciated.