I don't have your model/design of Tiffany bracelet but I do have an older one that I needed to send in for repairs.
Full post here:
https://forum.purseblog.com/threads/tiffany-bangle-repair-experience-and-price.1057303/
All in all, my bracelet kind of started with a design flaw, IMO, and both the hinge and clasp loosened overtime to the point of it basically falling off. It too would loose up and unlatch from time to time. Initially it started off because the clasp would press against something (like my body) but then it would just get so loose to the point of just opening up on its own.
Seeing how your hinge closure also had issues, I hope this is not a flaw on their bangle bracelets because that would be unfortunate.
I also feel that this shouldn't happen in general. When I first bought it, I never wore my Tiffany bracelet that often, but it quickly developed issues/flaws by the end of year. It appears that you haven't had yours that long either and having to exchange for the 3rd time would not give me any sense of reassurance or comfort.
Anyway, end of my story is that I sent it for repairs, they put a figure 8 safety clasp (and tightened the hinge and fixed the closure).
I don't wear my bracelet on the daily. I wear it probably months at a time and then take a break for 1-2 months. I've currently been wearing it daily (and taking it off and putting it on daily) for about 6 months. Honestly, my longest streak so far. And I am glad to say that I have not had any issues. The hinge loosened up slightly over time (no surprise, taking it on and off daily at this point), but not to the point where I feel it is a concern or it was as loose as before. The closure is still secure and has a very satisfying and strong click upon closing. The figure 8 clasp is doing its thing with no issues.
Regarding the chain safety clasp. Personally it would not bother me. As long as it serves its purpose and saves the bracelet, then I'd be okay with it.
You could ask if a figure 8 safety clasp can be done. I really love how they did mine (photos in my linked post above).