Constant singnal loss, no signal for 15sec, reconnecting to 3G - Xiaomi Mi Mix 2S Questions & Answers

Miui Version - Global 10.2 | Stable 10.2.2.0 (PDGMIXM)
Model - M1803D5XA
Country - Canada
Provider - Fido
Having an issue with my phone constatnly loosing connection, looks like it looses LTE connection, and then connects to 3G after 10-15sec of looking for a signal, then back to LTE in a bit.
It's very often, driving through city it will do that few times in 1 hour.
I can leave phone laying on table at home, and it will do that once in a while, while not even moving the phone.
I tried setting my preffered network to 3G, but it still went to LTE first for some reason.

The same problem
Is there any solution?

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I have a Verizon Note 4 phone I am using on T-Mobile network. I have been using the phone this way for over 30 days. I get 3-4 bars at any given time and the phone pretty much stays in the same area at all times (give or take 100feet). I get download speeds of 20-35mbs off of a Verizon tower so no problems with signal.
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