Partition letters constantly changing - Raspberry Pi Forums

hi,

have rpi2 running raspbian, use many purposes, started changing volume letters. normal mount setup this:

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 device boot      start         end      blocks   id  system /dev/sda1               1      409639      204819+  ee  gpt /dev/sda2          409640   623872871   311731616    b  w95 fat32  warning: gpt (guid partition table) detected on '/dev/sdc'! util fdisk doesn't support gpt. use gnu parted.   disk /dev/sdc: 500.1 gb, 500107859968 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773164 sectors units = sectors of 1 * 512 = 512 bytes sector size (logical/physical): 512 bytes / 512 bytes i/o size (minimum/optimal): 512 bytes / 512 bytes disk identifier: 0x00000000     device boot      start         end      blocks   id  system /dev/sdb1               1      409639      204819+  ee  gpt /dev/sdb2          411648   976773119   488180736    7  hpfs/ntfs/exfat 

keeps swapping letters c/b/ etc. can't run services plex because has drives mapped. both of connected hdds have separate power supply.
fstab looks this:

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proc            /proc           proc    defaults          0       0 /dev/mmcblk0p1  /boot           vfat    defaults          0       2 /dev/mmcblk0p2  /               ext4    defaults,noatime  0       1 /dev/sda2       /media/share   exfat    defaults,umask=000 0 0 /dev/sdb2       /media/share2   exfat    defaults,umask=000 0 0 

mount using uuid in fstab.
google examples.......

raspberrypi