When my car has stood overnight and got frozen door opens o k but when i get in it just keeps bouncing open their is no problem when the weather is normal

Your door latch needs some lubrication. In a pinch you can use a propane torch and heat the latch to get it warmed up and working freely. It only takes 30 seconds or so directing the flame all over the latch. don't get too close or you will burn the paint. Once you have the latch working, spray it liberally with a can of lock de-icer. Put the spray nozzle into the latch where the door hooks into it and rotate the spray can to get into different parts of the latch. The alcohol in the de-icer will evaporate the water or condensation in the latch. After a few minutes re-spray the latch with
WD-40 or RustCheck in the same manner.This will help to keep it from freezing again. You may have to occasionally repeat this process especially after a period of warm followed by a cold spell.
You can also accomplish this by removing the door panel and getting directly at the latch. If you do it will likely only have to be done once, otherwise you may have to do it from the outside a couple of times.
Doing this every fall should prevent it from occuring in the future. Hope this helps.