S-6 / Marshmellow / WIFI dragging

[Pacerdonfl]

Hi - bought very nice S6 from original owner (AT&T) - cleaned, and professionally un-locked.
Put Cricket Sim in - all works excellent except WIFI.....either very very slow or no connect at all.
Can use maps and google and such with WIFI off, and speed is excellent.
Turn on WIFI and connections suck.
My WIFI is excellent and reads VERY STRONG in WIFI setup....

Is there any left over AT&T stuff that is sucking WIFI to the ground?

Thanks for any ideas....

/Don

 

[tube517]

Marshmallow is probably the culprit. The update has caused many wifi issues.

 

[Sydney99]

I'm finding recently that leaving bluetooth on messes with my Wifi ....... switch off when not in use and all is good