[AC Question]

Made a few call on my mobile and these calls cut off and have to re call again. This is happening repeatedly after few minutes talking and nothing obvious at fault.

[B. Diddy]

Welcome to Android Central! Which phone? Is the screen staying on while the phone is against your ear? If so, the proximity sensor might be blocked or faulty, thus failing to turn off the screen while it's up against your ear. This makes it more likely to accidentally touch a button with your face (like the hangup button).

If the screen is turning off appropriately, then check with your carrier to see if there's a problem with the network.