Eurovax picture still jumping

[bravo_2_zero]

I just bought a Genuine eurovox 2008 box. I'm having alot of signal issues although i'm getting sometimes upto 90% quality on the signal bar.
The picture either breaks up or picture is ok then makes chopping sounds. I only get the chopping on some channels and only happens at odd times, which seems 9am-3pm then 6pm-11pm like when the lines bussy.

I have bought brand new cables that are shielded as my original N*L cables were 8 years old. The Issues are still the same.

I have a 2 way splitter and have tried connection without splitter and it still stutters etc....

I am thinking of Buying a signal booster from eBay, it's one of them yellow things found in the cable Tv section.

Will this make my viewing less stressfull ?