Galaxy S9+ wifi disconnects frequently

[VijayJagan]

My Galaxy S9+ phone is disconnecting from my home wifi router frequently and I'm noticing this issue since last 1 month after June month patch update. I have tried all the possible options and finally did factory reset and still this issue persists. 

After enabling wifi logs in developer option, I can see that sometimes wifi connectivity throws error "NETWORK_SELECTION_DISABLED_ASSOCIATION_REJECTION=1". 

Anyone else facing similar issue and found some solution?

PS: All other devices (laptop, tab and other mobile devices) connecting to my home wifi router is not having this issue.

[Patrick]

Let me tell you what I would do if I had your problem.

First i would factory reset my router.  

Than reset network settings on my phone.

Than just connect the phone to your router, no other devices. 2 things can happen now

1 the phone still disconnects meaning there is something wrong with the phone

2 it works fine and there was a conflict in the router.

Please test it and get back to me.

[VijayJagan]

I will try this. But any idea what this error means? NETWORK_SELECTION_DISABLED_ASSOCIATION_REJECTION=1/2/3

[Patrick · Accepted solution]

It means the router rejected your login attempt maybe someone changed a setting somehow.  Reset the router to factory this should fix it.  And than forget the Wifi password on your phone and re enter it. Make sure you got the right password.