Can anyone help me diagnose this internet issue?

[Leo]

I just recently switched over my internet provider to Comcast Xfinity and everything is working fine with the exception of my only computer that is working off of a wireless connection. Whenever I look through my available networks, the one that I'm meant to connect to is there, but does not allow me to actually connect to the network. When I click on the network, it says, "The settings saved on this computer for the network do not match the requirements for this network". The only other available option for network connection is the "Other Network" option, which lets me input the name of my network and the security key of the network, and I get internet while the computer says it's trying to connect to the network. Whether or not the computer actually connects successfully to the network is kind of hit-or-miss and I can't seem to identify an actual method to when the connection is successful or not. The usual process is: Name, security key, attempting connection, failure to connect, rinse, repeat until the internet gods decide to smile upon me and allow it to actually connect. The weirdest part is that the internet is available during the process of connecting and then the connection is lost as soon as I'm told the attempt to join has failed. I can't wrap my head around this problem at all and any help with this issue is appreciated.

[Sonic]

top reason could be a weak wifi signal, 2nd top reason is usually a faulty or old buggy router