I understand this might seem a bit bizarre, but my cursor only moves in certain conditions. It never has spontaneously moved when I have been inside for instance. Only when I'm outside and when it's rather windy does my screen seem to scroll upwards.
This is a problem especially when I'm typing a text message for instance, because as I'm typing the screen moves up and I type into nothing.
This is quite an issue, not major because most of the time I don't experience it but when I do it can get on my nerves.
Is this because my device is defective like I've been able to read in a few other threads (although it wasn't described exactly like my problem)? Or maybe it's an interface issue? I am nevertheless pretty convinced it's a physical problem.
Sounds like a problem with the touchpad on your phone. It's optical, so it could even react to shadows. Try turning down the sensitivity a little and see if that helps.
I have a 9780 Bold. It's not a touch screen, but I have encountered my cursor moving on its own, specially if its windy.
You can try turning the sensitivity down. Unless your like me and need it high. I did a security wipe and it fixed it for awhile, but I ended up reloading the OS and it hasn't happened since.
PLENTY of threads on something similar throughout the years. its a hardware issue. ive had two 9800s replaced over this and replaced my old 9700 trackpad myself due to it. please search next time.
