Villain and I each have $95. This about my 10th hand at the table. I have 100 hands on him, his numbers look good (something like 20/5/4) but I've watched him do some donky stuff postflop.

Villain limps in EP, I raise in MP to $4 w . Folds to Villain who calls.

Flop ($9.50): . He checks, I bet $8, he calls.
Turn ($25.50): . He checks, I check.
River ($25.50): . He bets $19.

Why do I call this? I'm checking behind on the turn because I think he has a set, so the Q should make no difference.

Very next hand same Villain min raises from EP w TT, I flop a set of 9's and win back what I lost in the previous pot.

2 hands later: I limp in LP w KQo.
Flop ($6) . Checked to me, I bet $5. All fold except for same Villain who calls.
Turn ($16) . Villain checks, I bet $15, he raises to $30. I make a donk call.
River ($75) . He bets $25 and I make a steaming call knowing he has 33 or 22.

Normally I fold to the check min raise without a problem but I was still a little mad at myself for paying him off in the first hand. "Do you really have a set vs. my Top 2 twice in 4 hands??" is what was going through my head.

Both of these should be easy folds, right?

Hand one is probably an easy fold for a lot of the players here.

My problem with hand 1 is this: Checking the turn is gonna induce a bluff a lot of the time, once you make two pair it becomes even harder to fold, unless you truely believe he limped / calling UTG with KJ.
His bet on the river is big, it looks like he doesn't actually want a call, having said that, he could just be greedy or he could be thinking 'lets make this bet big so it looks like a bluff'

Hand two i think you are definately beat, but I think on the turn he could easily have the straight draw and flush draw with A5s . The turn is re-raise or fold, call is horrible IMO because you gain no information and are still likely to call another big bet on the river.

It is easy to go steaming when these guys keep chucking check min raisees at you, most of the time it is a monster, but it does become hard to believe when they seem to do it a lot in the space of 10-20 hands.

I don't play FR but I still call hand 1 pretty quickly as he'll have Ax two pair here a lot. I also raise more preflop.

Hand 2 I don't limp KQo in late position it doesn't like multiway pots, raise it up. When the flush hits the river in the 2nd hand I don't like a call though he's pricing you very well (At least at 6 max tribeca the smaller bet on the river is usually a milking one)