It is possible that temp sensor is not reading correctly. Because if temp go more than 100 it shut down or fry.
It it is really any physical problem. So i suggest to check that which part is heating and install heatsink over them.
But be carefull.
Oh yeah. Asus is best choice if you really want to spend money. So asus prime x370 sli.
Ram. G skill trident z. Rgb . It is also a great choice go for them.