I'll agree with Armedsask that the cycle of your bolt is not 100%. Unless there is a broken or damaged part, I think a "really good" cleaning is in order. I understand that you've just left the military, and have had weapons maintenance training, however it's typically platform specific, ie. issued C7 or C8. I find that any courses I've been on where these are the primary weapon being used, that there is no shortage of oil being deployed, and the guns are very "drippy". At a facility I attended in North Carolina, instructors had spray cans of break-free in their cargo pockets, and when the guns got sluggish, out came the juice.
The Tavor on the other hand doesn't require this same level of petroleum dependency that is found in your typical D.I. AR operating system. Mine are quick to clean, and never as soiled as the AR's I use.
All that being said, give the armorer's manual another read, and do a basic field strip of the rifle, and clean out all the old oil and crud that remains inside the gun. If you have the ability to do it, you may want to remove the barrel (read instructions thoroughly and take out cocking rod before turning the retention mechanism, otherwise you're gonna be ordering a new one from CanadaAmmo). With the barrel out, you can remove the gas cylinder assembly and give it a good cleaning and inspection. As well, you can check the gas passageway to ensure that it isn't obstructed partially, and really clean the chamber area where the locking lugs engage - de-carbonify (my own word) the locking lug area. Again, following the armorer's manual instructions, you can do a full bolt and bolt carrier guide disassembly cleaning and inspection. With all parts cleaned and lubed properly, you can slide the gas piston into the gas cylinder tube to see if there is a close tolerance, and that it isn't hanging up on anything.
Reassemble the rifle - function test it, then off to the range. You can try loading one round into a mag at a time. On firing, it should lock the action open after each shot. If it does this, the short stroking issue has been eliminated. Then move on to multiple rounds in the magazine and test for function again. Finger's crossed it works.
