@hs8 can you log into the modem and check the current Software (Firmware) version that is loaded. It should be V126.96.36.199 by now, which is a new version with a new kernel. Please post the Firmware Version.
If you have 7.x loaded, remap the drive on the pc, as the path description to the drive may have changed from version 188.8.131.52T6. I don't know if that would have different effects on the download side and the upload side. I'm making the assumption that you were accessing the drive with version 184.108.40.206T6 loaded, and doing so without any problems.