It's the "Operate My GO" in Home. But from what you say, you may well have a very different problem that isn't addressed with any of the solutions you've been hearing about. I think 'looping' is throwing everybody for a 'loop'. When we talk about 'looping', it is usually continuous reboots from the splash screen. Your problem sounds more like the 'phantom keyboard press' sort of problem.
I assume your device usually powers up normally, but then appears to take on a life of its own at some point? It's a 930, so it falls into the 'phantom'-capable list of units. Typically, the problem is in the upper right corner, and you wind up being sent to the nearest police station, but it could occur anywhere.
Are the random letters all the way at the outside edge of the screen towards the bezel? I know, probably hard to recall, but it's an important question in our process of coming up with an answer.
Especially if the phantoms appear to be around the outside, try cleaning under the edge of the entire bezel area against the glass with a business card or thin piece of semi-rigid plastic.
Especially if the phantoms are not at the edge of the screen, if you are running a screen protector of any sort, see if removing it gives you any relief.
If neither of those help, and the problem seems to occur around the bezel, you may have another problem that isn't so easy to fix, but we can certainly give it a try if so.
