Urgent help needed: Phone reboots continuosly after setup

I am currently experiencing continuous reboot on my Single Sim Z3+ phone on .253 firmware. It used to be ok but about a week ago I started experiencing this problem as soon as I reboot the phone after setting it up from a fresh install with full wipe. It seems to work normal on earlier builds like 28.0.A.8.266 so only happens on 32.1.A.1.185; 32.2.A.0.224 - .253. I repeat, I have done fresh install with Full wipe several times but problem still exists. Urgent help needed.
Thanks

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