Currently I think Gridcoin Blockchain is splitted into a lot of pieces, I always had an estimated reward period of 1 day, now I have 3 to 6 hours! But I am not on a fork, or the gridcoin.network page is also on my fork?
Another problem is, that I've lost or not received 200GRC that I've earned prior to block 1144000. You can see it in my gridcoinstats that I've got one reward on 2018-01-21 and the next on 2018-01-23 with only 3.5 GRC with a magnitude of 355, that should be around 200GRC and I saw that transaction for a short time and then it disappears because of a fork.
On 2018-01-25 I staked twice with each about 17.4GRC with a magnitude of 430, so I've got only 34GRC in 24 hours. With a magnitude unit of 0.25 (or 0.225) it should be about 107GRC?! Before block 1144000 I was staking regularly and the amount was right!
Please check your own staking values and report here if you have a similar issue!
Maybe it's a known problem on version change (I am using 3.7.5.0), or something special to me?