Anyone? Any idea why this could happen? Things I can look into?

Yes it is a very strange issue, I just feel i'm missing a setting that is probably causing the issue, thanks for replying Yes, have the latest firmware, 2013 based for v8 Yes, connected via wan port...

Region : India Model : TL-WR841N Hardware Version : V8 Firmware Version : 8.4 ISP : BSNL Hi All, Having trouble uploading to dropbox or google drive. If I use my old modem provided by ISP (BSNL) all...