Problem to load Facebook pics using a Time Capsule wi fi network

From some days ago, I realized my Facebook in my mobile phone, is not uploading the pictures when connect to my wi-fi network (which is provided by a Time Capsule). When I leave the wi fi network and I use my mobile phone network, then the upload works properly. I've been using this Time Capsule for more than 2 years and this never happened before. I've read in the internet, that this might be a configuration problem in the wi fi router of my Time Capsule. I tried to reset my Time Capsule, but it didn't work. Any ideas of how to solve this?