Did these problems exist before the xerun esc?

Did these problems start immediately after the install of the new esc?

If the problems started with the install of the new esc, it is most probably a wiring problem.

A demagnetized motor is permanently damaged and cannot be fixed, this happens by getting them too hot.

Try your old esc, or have another go at soldering.

na, it just happened yesterday for the first time, l'll solder the other part and hopefully all back to normal, still thinking about getting the 2650kv castle with 22.2v ;)

Don't do that. You will just kill another motor. If you want to run 6S stick to the CC 2200kv motor and be done with it. With right gearing and decent lipos (you already have a good ESC) you should be pushing 75mph+ easily and have a reliable, fast buggy. 2650kv motor will run hotter and on 6S it will be around it's maximum safe RMP. Not a good thing if you want your motor to last a while.

someone told me that l should run the 2650kV because of the weight of my buggy, it only weighs 7.71lbs 3.5kg with 11.1v and with 22.2v it weighed at 9.1lbs 4.12kg, it wouldn't run as hot as it would with a heavier buggy.

I would still go with the 2200 motor but it's your choice. I have used the 2650 motor in my RC8Be and it ran a lot hotter than the 2200. I tried it on 5S and it got very hot very quickly. I had to drop the gearing a lot to the point where the buggy started to feel slow again just to keep the temps of the motor down. With the 2200 motor I can gear it for higher speeds than the 2650, both on 5S, and it stays cooler. If you just want to go for speed runs then maybe the 2650 would be OK but thats not a setup that you can blast up and down the street all day long.

^^x2

the 2650 on 6s is fine for speed runs WITH COOL DOWN TIME BETWEEN RUNS.

It isn't intended for regular use over 4s.

The 2200 has more torque, and therefore can pull higher gears.