Yes, taking DMSA randomly, or periodically (any schedule other than every 4 hours around the clock) WILL result in redistribution. There isn't any doubt that this happens and some people have ended up far worse for it.

Andy Cutler (biochemist) even goes so far to say that if you want to make yourself permanently worse, just keep sticking to periodic DMSA dosing (pariticularly the typical 500 mg, every day or so).

He also warns against the high sulfur supplements like garlic, cysteine/methionine, chlorella etc. He's seen people end up far worse for it and some permanently. This is because these things mobilise mercury wildly, but do not ensure safe or effective detox. Those that do well on these things are usually low in sulfur and respond favourably when they supply some sulfur to their system.

Some people can get away with doing almost any mercury detox, so long as they mobilise mercury, their body seems to be very adept at doing the rest. other people can suffer horrifically from it.

I would not risk it. Mercury is dangerous enough without repoisoning yourself even worse with erratic chelation.