Maybe add some perlite or pumice or small grit to improve drainage? It doesn't need repotting every 6mo, but good drainage is important.

How many leaves did you loose and in what time?

I grew this from seed and over the course of at least 5 years and have lost maybe 3 arms. I do clip them when they yellow hope that is the proper procedure. Afraid also in the pic the stem of the Agave seems a little yellow as well

This almost always starts with a problem at the roots-depot and show us them.

I can't tell if the yellow in photo is the base of the leave or the stem. If you lost only 3 leaves in 5yrs, that would be very normal ageing - almost too few :) Oldest leaves eventually dry up, and I had more than 3 drying up in 5 yrs. I usually let the dry up completely and then remove. I don't think clipping them off is a problem. But if stem is yellowing - and usualy softens up - it may be roo problem, or rotting.

Here is one of mine, showing some dry leaves (you can even see some thick roots in a close-up; have to top the mix!). There are 4 there - plant has not been repotted in about 2yrs -, they are totally dry now and I'll remove them:

(Jeff, do you recognize it?)

Do as cactusmcharris suggested - get all soil off the roots, take photo of them and show us.

I water once every other week is that to much?? Soil seems to dry out but cant tell if completely dry looks healthy oveall I think

I wouldn't think that is too often, but it all depends on your soil water retention (I believe I water mine more often, if warm enough). I keep all succulents otdoors in appropriate weather, and they get rained on. I water them it is not raining for a while.

You can check the moisture using bamboo/wooden skewer or chopstick, pencil will do too. Stick deep into pot and leave in for few minutes. If dry when pulled out, time to water. If wet, and sometimes may have soil particles sticking to it, wait and repeat in few days.

As I said, drainage is important. You can see lots of perlite and grit in my pot - hardly any soil. It drains very well and fast.

Are the yellowing leaves plump and full of water? Are they soft too?

Yes they are soft and mushy I just thought they were spent

Soft and mushy is usually sign of rot or water-logging (which often starts rot).

Old leaves will start yellowing, but it is different yellow - water-logged plants have that watery-yellow color, almost translucent.

If my plant, I would take it out, clean all soil off and make sure roots are healthy. Do as already suggested by cactusmcharris - take photo of them ad post.