I've experienced this same issue since I received the phone last year, and have posted here about it. ASUS did provide an update at a certain point in time last year which seemed to have 'fixed' the issue, however the issue came back after that updat...
Irene2_ASUSHi @StaggeredAmusement , @jrzenfone8 and @j4y600,Check your inbox for a PM from me View post@Irene2_ASUS, could you please PM me this same information? I've responded in a different thread regarding this exaxt same issue. Thank you.
Having this same issue on latest firmware (30.11.51.103). Using headset with mic on any call, phone will shut down somewhere in the range of 60secs to 3mins in the middle of the call. (edit to add: just confirmed on the update today (9/2), 30.11.51.1...