Picked up a Samsung Galaxy Tab E tablet a month ago. My big Logitech bluetooth keyboard works with it OK, but it created this stupid, annoying problem: every time I started typing, if I was the least bit sloppy with my shift key finger (left pinky) while pressing the spacebar (such as pressing space after the word “I”, which happens a LOT), the tablet would take that key sequence to mean I was selecting the keyboard language and would eat up the space keystroke, pop up a notification that I had selected the English (US) keyboard, and would pause my typing until the notification disappeared. I could not type delicately enough. This is untenable.

Luckily, I found the problem: in Android, all keystrokes (external or otherwise) are filtered through the selected keyboard input method. In this case, it was the default Samsung keyboard. Once I installed Google Keyboard and selected it to be the default input method, the problem disappeared because GK uses a different means to select language.
It’s the little things like this that just go completely under the radar and slip into production. Tiny little annoyances accumulate; so far, my experience with this tablet is lackluster (Bluetooth sometimes stops working and the SD card goes missing). Maybe I should’ve stumped for a more expensive model that’s had more dev resources allocated. Then again, who’s to know if Samsung functions like that?