Try connecting bluetooth instead of wifi. Turn on hotspot & bluetooth of phone 1 and bluetooth phone 2. Select to connect to bluetooth of phone 1 from phone 2. This solved it for me, i had this issue too.
I play pokemon go on 2 phones. Stable for 3hrs straight gaming no issue with bluetooth, but with wifi will disconnect occasionally.
Try connecting bluetooth instead of wifi. Turn on hotspot & bluetooth of phone 1 and bluetooth phone 2. Select to connect to bluetooth of phone 1 from phone 2. This solved it for me, i had this issue too.
I play pokemon go on 2 phones. Stable for 3hrs straight gaming no issue with bluetooth, but with wifi will disconnect occasionally.