Tales From the Eridian Slab and system shutdown

I’ve been having an issue firstly with my Xbox One X and Xbox One S, randomly shutting itself off while either playing Borderlands 3 solo or sometimes if I join up with a friend online or fast traveling.

My other issue is the achievement Tales From the Eridian Slab. I’ve followed multiple online guides to find every slab and active it, however the achievement is not unlocking. It was suggested to go to Tannis’ lab in an online game and keep pressing X to read that slab until the achievement unlocked but that has not worked