Do masternode rewards start staking on their own if Core wallet is open? Ive had ~250 PHR stakes from MN bu no staking rewards yet - almost a month uptime
If the wallet is open and unlocked for staking, yes they will stake. You can bundle these 250 PHR (send all to yourself in one Transaction) to maybe have a higher chance. But if you have collected these 250 in the last month and started from zero I don't wonder you didn't got any reward yet.