I have 2 equinox units...first one dunk after 10 months of intense use, but very few times in the water. The second (brand new too) dunk yesterday, after heavy use 6 months in the sea water, until chest, almost every day. But this time happens after 2 rest days from water, and in the dry sand...after just 1h hunting under the sun (35°). No matter if u make a bath test, sooner or later your NOX will pass away.
I always thought that good units were the most, but now i maybe changed my mind. There is something "weird" in the assembly or whatever. The project itself must work, because was developed by minelab engineers...but someone didn´t calculate the stress events (heat, salt, water...) or someting goes wrong in the assemply process. My first flooded unit has battery pod very flabby. My second was so tight, that i couldn`t get it out!! So what`s the problem?? Goretex membrane? Speaker? battery overhit? phone jack? USB? I don´t really know.
Anyway, my strategy works better: 2 brand new units, just one in the water. When it dunk, i send to ML for cpu replacing, and i can hunt with the other meanwhile. When it comes back, i put the other in the water...and so on. After 3 years, i will sell both and buy new, like an "extended warrenty", in loop :)