Did you try cleaning the usb port and the cable?
Yep.. And try another cable so you know the cable you're using isn't causing it..
Do you use the official charging unit?
This happened with me too... remove the cable n clean it from charger end too..
then again try to charge your phone...if it still doesn't work try pressing finger at usb port on. charger..it works ..
it happens due to loose connection...
I already tried all of above-mentioned step but it can't ☹️
You mean it didn't help?
then you must contact customer support
Another brand cable don't work properly with oneplus charger it charges the device slow, i have tried. I guess its time for new oneplus cable
New Raffle: OnePlus Buds Z
by Loren Z., 2020-10-22