I can reboot my phone, start Hangouts or Drive (sheets) or FireFox and 90% chance it's fucked up. I haven't tested it, but I'm pretty sure it is impossible to type for more than 5 minutes straight without this bug manifesting.
EDIT:
As soon as I open HNagouts and start typing. Shit hits the fan. Last 10 minutes I was editing a couple of sheets. A friend of mine sent me a Hangouts message. I switched apps and started typing, You coun't meout whIh d ty = You couldn't make out what I had typed,,,, AArgh.
Edit2:
Seriously I am going back to stock. This is absolutely ridiculo