Clogged Vent? Toilet Bowl Refill. Hadley Housing Authority 13 August 2019

Not the best example here, but for 7 1/2 years now, there has been some bubbling in the toilet bowl when tank is emptied and bowl begins to refill.

Also, when the toilet in the adjacent apartment (just on the other side of the wall from my toilet) is flushed, the water in my toilet jiggles. In addition, my kitchen sink bubbles when adjacent neighbors on other side of wall empty their sink water all at once.
Please see other videos on this channel of water backing up into the bathroom sink.

Please see other videos of bathroom sink, next to toilet, backing up.

2019