USB ultra fit 64GB getting VERY hot!

My new USB ultra fit 64GB is hot when idling and VERY hot when moving files in/out.

Is this normal and acceptable for longevity?

I thought the idea was to leave it in permanently, but it looks like it has to be removed to stop it cooking itself.

SanDisk have offered to replace the Ultra Fit with an Ultra Flair. But the Flair is 3x the size!

I am going to get a refund on the Ultra Fit and get a Cruzer Fit instead. It may be slower but it does not get hot.