Just little
there are times that even new MB ram and cpu even as new ends up being bad. There was some issues that I had for almost 6 months on a build a few years ago that drove me nuts. Come to find out there was some little thing (Don't remember now) that was bad. Everything would work for about the first hour of use as long as it wasn't playing games. Sadly where I bought it from has a you buy and install any issues is your issue. Honestly I think some of these can be returned/replaced and sold to the you take it you break it area to drive people nuts. After buying a new board it was all great. This was years ago and now I just buy Whole computers I don't want or need a Big gamer computer or anything special anymore.
Good luck hope the Ram is the issue
James