today my mbp randomly stopped and started charging every few seconds. first i switched the charger with my mothers, but i had the same problem. then i tried resetting the PRAM and SMC, but i still had same problem. after doing that i tried switching out the charger with my mothers again and that seems to work now. but the weird thing is that my charger works on my mothers mbp, but not the other way around. i have tried switching back several times but its the same.. both chargers work on my mothers but only my mothers work on mine.. what could that be?