generally not a good idea, it often turns to mush when refrozen. however, fresh frozen roe, uncured can be thawed, procured then boraxed and refrozen. plain borax roe does not turn out so good after freezing fresh and then curing. whenever possible, douse, fresh out of the fish, roe in cold clean water or lightly salted water (coarse salt not table salt) 1/4 cup salt to 1 litre water mixed well. this helps remove the blood from the roe, very important for a quality cured product.
I cut my roe into chunks and allow extra juices to drain out for an hour or so in the fridge on a old small window screen. I then toss it in fresh borax till it is liberally dressed in borax. spacing the chunks out on the screen to air cure for about 2 to 4 hours. I then shake the extra borax gently from each piece and repeat the borax process again with a batch of fresh borax. I then use the plastic peanut butter jars, bleached clean, and layer the chunks with liberal amounts of borax between and completely covering the roe at the top. leaving a 1/4 inch of space at the top, i place a small 1 inch square of tin foil at the center of the borax on top and just as i close the lid i throw a lit match on the foil and screw the lid tight. this burns off the oxygen and helps to preserve the quality of the roe for frozen storage for 8 months to a year in a deep freeze. generally one regular size peanut butter jar (1 litre?) will hold about a 1/2 to a pound of cured roe, enough for a day on the water. Once thawed it can be refrigerated and remain useable for 10 days or so.
i use the exact same method for procuring roe ( all my previously frozen fresh roe gets procured) except that i skip the draining steps after cutting the chunks. I get the blood out before i freeze it fresh so all i have to do is thaw the roe, cut it into useable size chunks into a gallon ice cream pail and then follow the procure directions on the jar. i procure for 2 to 4 hours then drain for 6 to 8 hours in the fridge. then i follow the borax steps above. this can be refrozen after curing following the steps above.
as for refreezing roe repeatedly, i wouldn't recomend it.