I have this problem too. Pretty much all my worst days have been on weekends. I've always been able to bully weak tables - but on weekends I either lose too much when all my cbets and bluffs are called (it always takes me ages to adjust) or I go on tilt when some fucker calls down my river bluff when a 2 comes and he's holding 5th pair no kicker (exactly this happened the other night).