no - I'm saying ... it's not your internet connection ,,, both establish the connection (in their own way) so if one works and the other doesn't the one that doesn't is bu@@ered.
you don't say which model of speedtouch (there are 1000000s) but If you say it's a modem (generally USB?) for one PC
there are other options ... but they are "lumpy" a new router is the first (and best) option - on your way out to pick up a new router ... drop the old one in the bin.
barb1314 will tell you how to set it up ;-)