jefpatat: You are not alone! I observe the same: There are more errors since a few days. VGTU has been rock-solid, but there are quite a few errors on my two computers since around 09th of March 2018.
Your observed RAC increase is because of the work-credit to computer time disparity since around the same time (7th of March). See below:
RE: The Gridcoin mining experiment - What is going on with VGTU