pressure fault on combi glowworm 30ci plus?

Ref above boiler - i noticed presure drop and cut out at .3 bar. refil didnt work so i replced fill loop. all seemed ok. however now pressure drops over night while off to .3 bar. when i top up the system to 1 bar and flash up the heating it goes up to 3_ bar and shuts down! pressure basically all over the place, also dripping ocasionally from reduced pressure zone valve. HELP