No they're not typical to any boiler this new.
I would say that 2,3 & 4 are unlikely causes in a fairly recent installation.
A quick couple of tests will rule these out.
Check the pressure relief valve vent ( 15mm copper pipe to outside) for dripping. Should be dry.
With the gauge reading about 2 bar turn the c/h on max ( turn up any room stats etc to max)
Watch the gauge as the pump and burner kick in. The pressure should rise maybe a 1/4 of a bar then stay the same. If the pressure continues to rise as the boiler gets to heat it will finally get to 3/3.5 bar and the pressure relief valve will open and reduce the pressure.(this would indicate a vessel with no charge )
Find the auto air vent in the boiler it looks like this
Check the top around the cap isnt crusted and wet , the cap should be loose by a couple of turns.If yery wet and crusty this would indicate the float inside isnt operating and either clean or replace.
If none of the above I,m afraid you are looking for leaks.
Hope this helps