Pi1 doesn’t have enough Memory (only 512MB) to start all the necessary daemons correctly. If it does after a few minutes it will be either unstable or incredibly slow - especially if you have a bunch of items or even worse a bunch of rules! 
so, yes, migrating to Pi3 will do the trick. You could try and insert the SD Card to another Pi - or I would recommend saving your configuration, installing openHABian and transfering the configuration.
