I have the same issue, wonder if its related to the other bug (https://feedback.bistudio.com/T150427)
I think my last functioning save had like 16 radios.

You can follow progress here: https://feedback.bistudio.com/T150427

Thanks for the tip. All my saves have been from the Pause menu, unfortunately that hasnt worked thus far.

Quick update: I have had success in opening save files that I couldn't before by playing ARMA 3 in 32bit mode, however saving is unreliable, as the game often crashes and I get a 0x0000DEAD - error code. Have had the game also randomly freeze in 32bit mode.

Same exact issues, post official release. Game saves stop working around similar point in the game (10-15 hours of gameplay), with stockpiling, have been really enjoying it. Thought the insurgent hiring aspect is available I havent used it yet, so I doubt that that is the threshold that is causing these issues. If the game only works by rushing through it I would say it defeats the whole point...and misses out on the most fun aspect (I mamaged to get the entire and absaloutely massive weapons cache at the Pearl Industrial Port just before I couldnt save or load any further). Save files are sitting at around 170mb...my system has 32gigs of ram. There are at least 4 tickets open on here with the same issue. Really hope it gets attention.

Having similar issue, have created a seperate ticket, but with 0xC000041D - STATUS_FATAL_USER_CALLBACK_EXCEPTION prompt, not 0x0000DEAD. Subscribing to see if you get any more responses. Save files are also getting pretty big, 170mb+
Roughly 10-14 hours of gameplay.

Having identical issue, subscribing to see if anyone responds with solution. Have created similar ticket, here: https://feedback.bistudio.com/T150427