Does anyone know what happens to staked pbtc35a tokens if mining efficiency falls bellow profitable?

Hi I'd appreciate some help in finding the answer to the above question I've searched for a white paper in English but all I can find are manuals on how to stake all seems fine but ....

2017 I bought a mining contract for monero and lost it few months later due to the prices going down early 2018 so would like to avoid the same happening again their efficiency is set at at35 watts/th so nothing to worry about as long as BTC keeps above around 6600$ which I can't really see it falling to but just in case of a flash crash that could be gutting if you were to loose the tokens at that point.