When I am typing (almost always using swype), sometimes my atrix stops responding. Letter buttons stop working and home/back functions also. How can I detect the app that makes it slow/freezing?
It that happens only when using Swype maybe it could be Swipe itself to lag!
You could told us if the problem happens when writing into any application or if it happens only with a particular app: if so it could be the app to give you troubles..
After checking all that, you could try to change the Swype options: maybe remove the automatic correction or change some others voice: than see if things go better..