tymmykThen I would like to log your phone in order to find out why
I can confirm the comment by ykaro.36. And what's more, the signal disappears (at times) totally for 5-6 secs and then reappears inexplicably. I've never encountered such issues im my previous Zenfone 2 & Zenfone 3 (running perfectly). Same issues with my previous Zenfone 5...
P.s. clear cache hasn't solved.