is this something others have reported?
It’s happened to a few people … but it doesent seem to be a common thing … could not find too many posts about it ?
I would definately recommend trying another USB stick … as i have heard of people unable to upgrade firmware (ie. no notification message to upgrade) … then they try another USB stick and it works.
Personally, i use a 2Gb Kingston FlashDrive which i only use for firmware updating (or rollback) … been using it for years with success.
One other thing … dunno if it will help … disable your network (remove ethernet cable or power off the modem router) just in case it’s having a conflict with online update. *just guessing* may have nothing to do with anything 
