What you are describing are classic symptoms of a low propane supply issue. It does not take much gas to burn the stove but after several attempts and bleeding the air the furnace/water heater lit. The furnace and water heater will both go into lock out mode after attempting to light and failing and you turning off the power is how you reset them. This is just my guess as to what you experienced and without being there and testing we can only guess.
One other thing -- leave both propane tanks on and the changeover valve will automatically switch to the other tank. Just need to check more frequently in cold weather.
Glad you got it fixed and thanks for letting us know.
2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.