LTE slows down after 7.1.1 update

[Ky666]

My xperia x (f5122) lte is slower than 3g/h after nougat 7.1.1 update at marshmallow no issue at all

I've tried several things

-factory reset

-sw repair using xperia companion from pc

-and i try to move my simcard to my z3c and it runs lte normally 

Any suggestions how to fix this issue or i should wait next update 

Thanks

[Qatrium]

Hello @Ky666

Would you please give more details about your issue?

[Ky666]

I've add the detail

[Ky666 · Accepted solution]

I've fix it i swap sim 2 to sim 1 and connect to lte using sim 2 then i swap them again finally its normal again