iOS11 cellular, GPS & clock problems

I have a range of problems after upgrade to the new iOS.

1) I randomly get a message that I have lost cellular connection, even though I have full bars. Typically I will be working on my phone, in the midst of work my phone starts acting as if it has lost connection, though bars remain the same and I am not moving.

2) All my apps using GPS are acting weird. For example, using Apple or Google maps, the display often thinks that I am a couple hundred yards off my location; Also when traveling the map often shows my direction of travel as 90 degrees off the direction I am actually traveling.

3) Randomly my lock screen shows no clock.

This OS feels like a disaster. This is why people are often wary about accepting new updates.

I want out.. can I go back to the previous OS? Or when can we expect this OS to stabilize?