Default Miro Touchsreen problem

okay i have this weird problem in my Miro. manytimes when i get a call and the phone rings, the touch suddenly stops working. the power buttons work fine but the touch just does not work. then either i have to pull the battery or touch responds automatically if i try later. i have faced this problem a few times earlier also(all on variants of stock based roms and pure stock) but ignored.
another thing that when the service reply messages comes say like when you turn off data, then i notice a small lag(including partial touchscreen disability). is this a bug in Miro stock rom maybe?
presently i am on vengeance reloaded with 5.8 firmware. anyone else faced such problem ever? any suggestions?