Read-only access to luks partition

I've formatted a partition on my usb disk using my ubuntu notebook.
Then I plug it to my lede router. Just after mounting the partition, the access is turned read-only.
The dmesg command gives several lines as the following ones:

               blk_update_request: critical target error, dev sda, sector 2097219583
[  624.052625] Buffer I/O error on dev dm-0, logical block 0, lost sync page write
[  669.891061] EXT4-fs (dm-0): Unrecognized mount option "user_id=2" or missing value
[  672.191276] EXT4-fs (dm-0): Unrecognized mount option "user_id=root" or missing value
[  773.633145] JBD2: Clearing recovery information on journal
[  773.665944] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
[  773.674376] sd 0:0:0:0: [sda] tag#0 Sense Key : 0x5 [current]
[  773.680353] sd 0:0:0:0: [sda] tag#0 ASC=0x24 ASCQ=0x0
[  773.685620] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x2a 2a 08 b2 c5 07 ff 00 00 08 00

After unplugging it and re-plugging it to my ubuntu notebook, I am able to access the partition in read-write mode without any error.

I really don't know what to do. Can be a problem about insufficient power at the usb port of my router?