Wifi Extender Giving Me Trouble

My WN3500RP WIFI Extender has worked fine for years now. However, recently it's been giving me problems intermitently. Sometimes I can't get on the internet with it and sometimes the connection is really slow. SOmetimes it works fine. I've recent it many times, I went to the mywifi website and reconnected it with "Genie" et.. 

I notice that a light with an up arrow and a down arrow is now on with a solid green light. That light never used to come on until I started having problems connecting. 

Does anyone on here have an idea of what could be wrong with my extender?  WHen I connect to my router without the extender my internet works fine, so it is not my routher or internet connection. 

Thanks for any help you can provide!