How many people do you know, Max? Why would 4 people with adverse health events in 6 to 8 months concern you at all? If only 4 people I know had adverse health events in that kind of timeframe, I'd consider that a banner year.
Why would you consider trying to tie any specific event to the vaccines? This isn't Deadpool; the vaccines aren't the cure for El Everything. People will continue to get cancer, crash their cars, have heart problems, sprain their ankles, and contract other health conditions, same as they did before COVID was a thing.