I have been having a similar issue, with no luck.
I had an MGW200 up and it was working great getting 98% RRR. Replaced it with a MGW 310 and now my RRR is 82%. Rewards are down ~40%.
I know it is an issue with the MGW310 as it is installed in exactly the same place as the MGW200 was. I have contacted GEODNET support and so far they want pictures of the install. Problem is it is a remote install 45 miles away.
I tried to get them to pull the data from the MGW200 and compare it to the MGW310 and it seemed i was speaking a foreign language. like how dare they use the data they already have to prove a product of theirs is defective.
once i get a picture of the install i will continue with them, but not very happy with the customer service so far. The MGW310 is brand new and not working properly out of the box. Ugh
MP12 and MP22 are multipath performance scores (lower is better). If either one is 0.75 or higher then it zeros out your rewards.
After GIP6 the following things will result in getting no rewards
RRR <80%
MP12 or MP21 >0.75
Dual band stations
You can see each of these performance items in your console when you look at the station details.
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