Flash drives and SD/microsd heats up and slow while transferring files, is this normal?

My new macbook pro heats up my flash drives/sdhc/microsd while transferring files. I thought it was just the Micro sd itself (using MicroUSB adapter) but when plugging in a differnt flash drive it too was getting hot and quickly heating up. I also thought it is pretty slow for a Class 10, which i dont think it is the it could be the flash memory, is there something i am doing wrong? its using mac os x journaled format. This also happens when i plug it in the sdxc slot. Any ideas?

I had another apparently hung Time Machine backup today.
Starting Dashboard did NOT fix it this time. However, after what seemed like a long time (probably 5-10 minutes) it apparently freed up on its own and completed the backup normally. This makes it appear my previous result was just "coincidence".
There were a few error messages thrown into the Console this time by the "backupd" process -- An "Error(-43)" while apparently attempting to find a path to a file with a "null" name.
Despite that, the backup seems to have copied what it was supposed to copy.

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