After updating to Android 11 my Samsung device is facing wifi connectivity issues . It is connecting and disconnecting it occurs very often

Every time I tap on credit card readers it is not able to do the transaction everytime iam getting the error. Iam doing transaction with sbi debit card

Battery is draining 1% for every 3 r 4minutes where as my a51 is not draining like that is this issues is for every one because that f41 mobile is used my mom

When I updated one ui to 2.5 I can see that in a51 ram management is totally worst. With two apps in background daily social media apps it tooks almost 4gb ram before that it tooks only 2.9gbIs this issue is same for all users ?

My M31s backpanel is vibrating while playing songs or videos is it same for all