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Since the latest software update, Android Oreo 8.0 (34.3.A.0.364) every time I go to switch on my Xperia it won't turn on unless I start it up whilst it's plugged into the charger.
Repair the phone with XC and report back, if that doesn't solve the issue, you should contact your Local support to get it inspected.
I've tried all that when I've had software issues before and it's done absolutely nothing, Sony need to be made aware of this so as they can fix this in their next software update.
It'll be wise to contact your Local support to get it inspected, keep in ind that this is a user based forum.
It's definitely a software issue as I've had issues like this before following a software update which the software repair tool under Xperia Companion has been unable to resolve have latter been resolved via a software update.
BTW do you own a Sony Xperia X Compact?
You have 2 options
either wait for a new update or contact your Local support, again, this is a global user based forum.