Kitchen drains stop up from all the cooking and pouring off of greasy liquids and any mild root problem that is going unnoticed when one or two people are in the house because it is still draining slowly can show up as a stoppage when a crowd arrives and the sewer line needs to be functioning at full capacity.
IF you live on a septic tank-—THERE SHOULD BE NO GARBAGE DISPOSAL AT ALL.
IF you need to keep your drains clear-—
Look into BIO-Clean.
google it. Available at Amazon.
Have used it for years on septic tanks. NO problems