If you've recently changed the Ram on that board it could have damaged the slot. I have a Strix Z390 board that I had to RMA almost a month after a RAM upgrade and the board was only 4 or 5 months old.
I've also had memory issues on a Maximus board as well that I had to RMA the board over, it was a brand new board.
I know how to install RAM, tabs aligned, notch lined-up, straight down, even pressure until it clicks into place. I've never had a RAM issue with a MB until this year. I've been assembling computers off-and-on for 30 years now and have built 6 in the last 2 years alone, 4 Asus boards, an ASRock board, and a Gigabyte board. The two I had to RMA this year are the first I've ever had to do that with.
Asus quality seems to be lacking lately, and not just with their MBs. I know people that have been having issues with their routers as well.
ASUS ROG Strix Z390-H Gaming
MSI GEFORCE GTX1080 TI GAMING X 11G
Corsair Vengeance LPX DDR4 DRAM 3000MHz
Samsung 970 EVO
All PrimoChill parts (Rad 360, Pumps D5, Fittings, and Acrylic Tubing), Byskey CPU&GPU Blocks
Windows 10 Pro
Thermaltake Commander F6 Fan Controller
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