refer this downgrading guide as well. it's the same method but more simple guide specially for mt4g with working links.
I am not using any battery savers. My CPU settings are whatever set by default. I haven't changed anything.
CPU settings below:
Current Max: 1024 MHz
Current Min: 245 MHz
IO Scheduler: row
Set on boot: OFF
It also ...
Never heard this kind of a software problem. I don't think it's a rom issue. May be your touch screen broken.