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Missus has had 105 calipers on her Sequoia from new and has gone from cable to Di2 shift levers (so there's been at least one bleed in that time) and never had issues. Maybe you just got a bad one or maybe someone got a bit frisky with a screwdriver during the install? Anyway, I'd just stick 105 or Ultegra on (I have Ultegra but I don't know the difference between them and 105 calipers)
I’ve got 105 hydro levers which I like and work, and had 105 callipers which were fine but leaked. Tried Hope callipers which are too fiddly to set up for my lack of patience. Should I get new 105 calliper or upgrade to an ultegra, or is there another aftermarket hydro caliper that works nicely with shimano levers?