Due to unable to find its provider/consumer tank quick enough on some occasions(determined by their relative positions), PWRs would sometimes meltdown on entering the world.
By enlarging PWR's internal fluid buffer to 512000(4x) I solved the problem, and players could catch the controller refusing to intake fluid if they check its GUI at the moment they enter the world.
According to some calculations 256000(2x) could probably be just fit for all cases, however I do not guarantee that.