Note 9 Network and Data speed issues

Hello

Please help me

I am facing serious network problem in my note 9

Sometime my network bar showing full signal and sometime its showing one bar in same location.

I have also Galaxy J7 max and both phone have a Same Operator Sim but J7 Max has a fast data speed than note 9 and no any network problem in J7 max

I go to the service center and they changed mother board of note 9 but my problem is not solved.

Please help me....


Note 9



J7 max