As you mentioned, check your connections to see if any were loose. If not, it seems like you may have a small hole/puncture in your tubing somewhere.
For me, once I get the siphon going, it's a very easy process, one bottle at a time but not a lot of effort. I can drink beer while I'm bottling more, always a good time.
I will admit though, getting the siphon started and going can be a trick at times, but even then it isn't that tough. Not enough to make me switch to kegs yet
GOod luck - have fun and drink the beer (in a few). Enjoy