5G network connectivity issues

I have been experiencing mobile network connectivity issues ever since I purchased my A56. First issue is related to switching mobile network operators.

I am using dual sim (not e-sim) from two different operators (different countries) that I switch in between whenever I cross borders.  Whenever I switch my mobile data to the operator that has 5G (the other operator only has 4G), my phone only manages to connect to 3G as H+.

I checked this in locations that has known good 5G reception and with other users with A series phones. They are not experiencing this issue.

Second issue is whenever I manage to have 5G connection (if lucky enough),  it will again randomly drop to 3G at a static location where other people using the same operator and similar A series phones are fully connected to 5G.

As for remedy, I tried swapping sim cards with no use. Some temporary fixes are turning airplane mode on and off. It used to work, nowadays it doesn't. Another one is resetting mobile network settings for both operators but it is buried so deep in the settings and requires authentication again that restarting the phone is more sensible, which is now my currently my go to fix.

I am not experiencing this with the other operator which has 4G. Switching back to it has always been reliable.

I've already read most of the similar posts affecting these phones and it seems there is no fix coming our way. Only workarounds or visiting the service center for a replacement at best.

I guess one restart a day keeps the bugs away but seriously this is so annoying that probably I will buy another mobile from another brand soon. 

I got the latest updates. No change yet.