I've had my trusty Suunto Stinger since 2006 and the only trouble I have ever had was last week when it decided to lock out on me after I mistakenly set it to Freedive mode after a Nitrox dive instead of setting it back to Air mode!
What it meant was that I dived on air to 30m for 43 minutes in Freedive mode and the Stinger must have thought I was dead so locked me out. (I wondered why it didn't offer me a safety stop on teh way up!)
Now the manual doesn't mention the computer going into lockdown mode at all, so after a couple of days of ‘No Fly’ and being unable to set the EAN / AIR profile I was just about to go to the dive shop - and no doubt be charged an arm and a leg.
Lo and behold! As the 48 hr period after my dive, the Stinger finally forgave me and reset itself.
So back to normal, but teh real point of this post is that why has no-one else had this issue before and posted about it? And why doesn't Suunto tell you about lockdown in its manual?
Suunto stinger doesn't allow you to get into dive mode, air or nitrox, after a freedive for 48 hours (not sure if it is 48 or 24 hours) by default. I think that it doesn't allow you to switch to freedive mode after a scuba for the same time period too. It is mentioned in the manual somewhere.