Back in January I received a email, stating that their was work happening in my area and I may have problems until 17th January funny thing is I hadn't had no problems until the 17th when the work was meant to be finished.
My internet keeps going down usually after midnight, but when It goes down its not on everything could stop working on my phone, laptop but work on my TV and my other laptop (all wireless) sometimes it may stop working on my Xbox (wired) but work on everything else that's wireless and I'm having to do a reboot at least once a day to fix it all every time.
A Engineer did visit last week, who claimed that my Wi-Fi was to weak in my bedroom and stuck a booster on it, funny thing is my hub is in my bedroom?! I receive 100% signal being that close as you would expect, and the booster hasn't done anything, also my TV, PlayStation , tablet are all in their receiving 100% signal this was never a problem before! if I was to take a wild guess I would say I need a new hub but I'm no expert.
Surely if there are FECs then it means interleaving is doing is job? How about any errors present that aren't corrected?
I'd suspect you have wireless interference, and possibly a case of REIN (a type of interference) if the FECs are present, as errors are being corrected to some degree. REIN could effect the incoming signal too.
If you run a scan with Acrylic (for Windows) or WiFi Analyzer (for Android) can you post the graphical output so we can have visibility on your local wireless environment?