when the Claim is made while the present trick is still table'd , and you claim the remaining tricks, you have to deduct that trick if not quilted already as winner or loser, whatever it might be. but if a claim is made mid trick, and it is rejected for whatever reason, be it a player loses connection, the claim is rejected on that principle, if it s not a connection issue, and an opp has rejected because he / she does not see the claim as you have claimed it, since you might not have stated a biding line of play, ( as per laws) etc, then when you adjust your claim but play the last trick till quilted , the minus -1 will still be deducted although so you might be claiming a making contract -1.... same with the problem of second issue you stated, you might not have adjusted the correct claim manually yourself, best I can offer from my experience in bad claims.... but as for clitch, I really do not think so,, unless it is your computer itself, buggering all up for lack of technical term, I am a bridge player,(sometimes) not a computer tech
:) Cheers and may all your hooks be onside!