More information needed.........
A little more info may help out.
When you attach the lanyard, you should get 2 beeps, this signals the ski is ready to start.
Your second statement is that, sometimes you don't get any beeps. Well, when you don't get any beeps, does the ski still start?
If you get 2 beeps and the ski starts, other times you get no beeps and the ski wont' start....this can be your post. If you don't get the two beeps and you pull the lanyard off and put it on, several times, then get the beeps, it's the post...........you'll need to buy a new one. This is a simple replacement and needs no special tools........
Click on this link and you should be able to find your post.
http://www.seadoowarehouse.com/
Only if your symtoms are as described above, may your post be bad....
Real quick info...........the lanyard cap has a ROM (read only memory) chip inside of it, that when connected to the post, which is magnetic and the communication between the ROM and the MPEM, will you be able to make up the signal to the DESS and get a start. If the magnet in the post becomes weak, you'll have a problem communicating with the mpem. It's very sporadic. It will get to the point that when your riding, the engine will shut off.............:cheers: