Indesign 15.1.2 user here.

Abnormally while im working in big sized files in indesign, whenever i press my Type Tool shortcut (which is "T") cursor goes to Type tool for a second then goes back to usally selection tool.

When i go and choose the Type tool from left side bar it works.

Im using windows pro 10. Re installed the program for few times.
Saw other threads opened for the same issue but looks like you guys closed time bc it is fixed. But it is not! And it is incredibely time consuming!