Why my phone sometimes can't connect to internet?

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Android Central Question

Details: Lenovo K5 Pro, Global ROM (in EU), Android 8.1.
I have a problem with data connection, when screen is locked or recently unlocked, data connection sometimes isn't working, even though the connection shows as working.
In Chrome I get errors like: err_connection_closed, err_ssl_version_interference, dns_probe_finished_no_internet.
The weird thing is, when I have turned on hotspot and use internet on my laptop, it never loses connection for the whole evening.
All apps have 'unrestricted data access' and 'background data' enabled.
 
Try this


Start with the phone Off.

Press and hold to On.

When "Lenovo "logo is displayed, release the key On.

Immediately after releasing the Power key, hold the key Volume down .

Release the key Volume down when you see Safe Mode appear in the lower left corner of the screen.
 
Try this


Start with the phone Off.

Press and hold to On.

When "Lenovo "logo is displayed, release the key On.

Immediately after releasing the Power key, hold the key Volume down .

Release the key Volume down when you see Safe Mode appear in the lower left corner of the screen.

This is one of the methods I tried multiple times. Just tried it again, didn't work.