When connected to my talktalk wifi, I am unable to access Facebook/Instagram via my Sony Xperia. If I disconnect from the wifi and go to normal phone data connection, everything works fine. I have no problem with any other wifi connection I use, just everytime I connect at home.
Strangely, connection via laptop and other phones used by family is fine.
My router is Huawei H1 01. It is getting worse all the time as I am now also unable to connect to Alexa, unless using standing phone connection. It is only my Sony Xperia that has problems, but it never has problems using other wifi connections, only my own talktalk connection.
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Try switching off the router for a few mins, this will flush its cache, which will speed things up a bit. Do the same for the facebook app, go to your settings, find the 'apps' tab then find facebook app, depending on what version of andriod you have, choose either memory or cache and delete it, you could do the same with storage/memory (mine is currently sitting at 627mb!!) This will definitely speedup facebook.