Hey Coulomb thanks for the reply. We got the error at night so no panels active at that point and the error does not maintain it is momentary then restores back to normal.
What we did try was changing the priority setting to SBU this did solve the issue. We then got a firmware update from the supplier, version was 7204, and since the update we havent had the issue on both SUB or SBU. I will post if it does reoccur.