There are numerous threads in here and countless others on the wider internet about the ropey motherboards on these phones. Asus' response seems to be to shrug and pretend it's not happening or, at least, that's it's not as big an issue as it clearly is.
I am on my 2nd Zenfone 6 and they've both been struck with this issue. What are the chances of this happening if there's no large underlying issue with these phones?
I've been back to the seller, it took them 2 months but they replaced my original handset and now, unsurprisingly, when I've told them this one is knacked as well, they don't want to know. I've been to Asus and my repair claim was rejected. I feel my only recourse at the moment is to either put in a claim with Paypal and hope they will refund me or to beg for spare parts on these forums like other victims of Asus.
I'm not too sure whether it's Asus as a whole or just the phone wing of the company that act like cowboys but I'm certainly not in a hurry to ever buy one of their products again.