Why does my toilet burp nouns next to respectively flush? Our home was built within 1989 and is a two storey semi...

Our home was built within 1989 and is a two storey semi with subterranean vault.
Answers:    Sounds like a clogged vent pipe. One piece you can try is to fill the tub surrounded by this room and then release the river. Watch the water contained by the toilet bowl and if it moves, it is a vent problem. Could be leaves in the pipe or even a spiderweb that have collected condensate and frozen.
might be time to get your septic container drained.