You could have a grounding problem or , unbalanced Electrical Load.
However , From your description , sounds as though the kitchen circuits are overloaded !
Present day code requirements are that the frig , dishwasher and microwave be on seperate circuits, with another 2-20 amp circuits being available in the kitchen area for coffe pots ,
mixers etc .
Having all of the appliances you've described on 1 circuit will certainly overload any system,
hence the requirements for separate circuits