Based on read speed. 1 MB/s = 1 million bytes per second. Based on internal testing; performance may vary depending upon host device, usage conditions, drive capacity, and other factors. USB 3.0 port required. I’ve tried blowing cool air regularly into my USB hub and it appears to remove the disconnect issue, which clearly shows that this is a heat issue.

SanDisk 128GB Ultra Fit USB 3.1 Flash Drive Up to 400 MB/s

I bought the 64GB Ultra Fit to use as extra storage for my Chromebook. After leaving the Ultra Fit in either the USB 2.0 or 3.0 slots for a mere 5 minutes it gets considerably hot. Even AFTER ejecting the drive and leaving it in it is still getting hot. In the 3.0 slot it gets so hot you don’t want to hold it.The Verbatim branded thumbdrive get really hot(whole body is aluminium) even if plugged into smartphone after prolonged use.

SANDISK Ultra Fit USB 3.1 Memory Stick - 32 GB, Black - Currys SANDISK Ultra Fit USB 3.1 Memory Stick - 32 GB, Black - Currys

I know this is a rather old thread, but I wanted to post my experience with this device too, as it is a little different from yours (and nearly everyone). I bought the SanDisk USB OTG 64GB thumbdrive, it feels hot at the USB connector, but not as hot as Verbatim 64GB Thumbdrive,I’ve tried the drive in both a USB hub and directly on the ports on my motherboard. They both cause it to fail eventually. In my computer’s USB3, my receivers’ (One Onkyo and the other a Denon) and my samsung Bluray I have noticed heat issues… So I tried it with a USB 3.0 extension cable and it also gets too hot to touch, but I don’t think my transfer went long enough to have it disconnect. I’m going to try it with my laptop’s port after it cools down.

SanDisk Ultra Fit™ USB 3.1 Flash Drive Datasheet SanDisk Ultra Fit™ USB 3.1 Flash Drive Datasheet

I’m wondering if this is due to the LED in the case that is constantly (24/7) blinking and drawing power? Maybe this was designed to only blink when read/write??? RescuePRO® Deluxe file recovery software 4 helps you restore files, even if they’re accidentally lost or deleted.With capacities up to 512GB 6, you can store more of your critical files and important photos, videos, and more.

SanDisk 32GB Ultra Fit USB 3.1 Flash Drive Up to 130 MB/s SanDisk 32GB Ultra Fit USB 3.1 Flash Drive Up to 130 MB/s

I found this same problem. And the main reason is that it poorly designed when compared with Cruzer Fit. I also noticed right after I plugged the flash drive (Ultra Fit 3.0 - 32 GB) for the first time that it got insanely hot, even after transfering files from or to the device and having it ejected. This happened in every port in my desktop computer, 2.0 and 3.0. However, I brought the flash drive to work this morning and transfered over 25 GB to my work desktop (2.0 ports only). It took about 8 minutes to do it and it didn’t even get a little warm, nothing, which suggests that the problem has something to do with the ports the flash drive is connected to, and not only the the drive itself.

If you look closely Cruzer has 6 vents/cutouts in its sheet-metal. So it provides a better heat dissipation. Whereas Ultra Fit has none. Designed for plug-and-stay storage, this compact flash drive works with laptops, tablets, TVs, gaming consoles, car audio systems, and more. Plug it in, and you’ve got instant storage that’s always available!