I ended up with 95 PTS immature, two transactions for 47.5 PTS mined, checked 5 hours later, found block count was stalled at 1089 though still hash activity 5.14/minute. Restarted qt, block count went up to 3004, immature PTS disappeared. Any explanations pr reference link?

Same to me, two blocks were in immature staying there up to 5 hour and when I restarted my PC they disappeared.
Some kind of orphans I guess?