temperature gauge please help

vroomvroom

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2009 Pontiac g6 2.4L 4 cylinder
About a month ago, my temperature gauge dropped to below zero, instant drop while driving. Went home, changed the coolant temperature sensor, and it worked again for a week or two till doing the same exact thing. Thermostat and thermostat housing was replaced a year prior. I received a PO128 code and a p0000. Cleared the code, and unplugged my battery for a while and it all worked again. Broke again on my way home today and no idea where it’s going wrong. I’ve noticed i’m losing coolant quicker, but no leaks under my car. Any ideas on where to go from here? Once I unplug my battery it works again for about 1-2 weeks before breaking.
 
If you are losing coolant you either have an external or internal leak. Rent a pressure tester and buy a coolant hydrocarbon test kit.
Do you currently have any codes?
 
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