I have the Z97 version of that board, and while I don’t remember if I had any issues with memory leaks, it did cause a lot of performance problems in Cstrike and a handful of other online games.
Went away when I manually installed the Qualcomm AR8161 drivers.
According to some board partners and possibly Qualcomm proper, the E2200 driver problems are caused by the included software and not the ethernet driver it’s self, however I can tell you the E2200 management software running alongside the AR8161 drivers fixed those issues in my case, but the E2200 driver without the software did not improve things at all.
IIRC they’ve made it difficult to get the AR8161 generic driver package now, to stop people from installing it on their E2200s for whatever reason, but if you can find them, it’ll probably help to use those over the stock MSI E2200 drivers.