Hey, Like others said, you need to have backup mechs for the multi-missions. In addition, I would make sure you have high quality mechs with top tier weapons when taking these types of missions on so you get the most mileage out of your good mechs before you have to start using your back ups. Heres some tips; Switch mechs mid-mission. If you notice your mech is getting damaged, armor is in the red or internal structure is taking damage, switch to another mech. The mech you pilot is going to take the most aggro, switch before the mech takes too much damage and youll likely prevent serious component damage. Another thing – make sure you are properly kitting out your mechs. I always strip the mech and then immediately max the armor. You want max armor on everything, only remove armor from legs if you find you need a little extra space. The game should automatically allocate most armor to the front instead of the back, but check and make sure your armor is mostly on the front. Then carefully consider your weapon and heat sink choices. If you have some good back ups mechs, good weapons, and you remember to switch mechs mid-mission to preserve your mechs, you should have little to no issue doing the multi missions.