<span class="commentBody" data-jsid="text">Just wanna update the solution in after 3 long months since the initial problem, the situation was solved after changing the original vstank motor to using my distributor personal stash of japanese mabuchi motor. He also did a run-in of 30 minutes (slow speed running of tank in a stationary position) before we start testing. So far the tank has been running perfectly. Vstank previously suggest to do center rotation when the situation happen which after we tested, it was not very reliable and didn't actually solve the situation. So all in all, buy a new pair of motor and if you have the experise, replace it yourself and do a run-in, else find someone who has the expertise (my distributor did the replacement for me) and do it. Hope this helps anyone who has the same issue!</span>