Same pattern of lag

in single player and in servers, whenever i log on it always lags in the same pattern and same time. It only goes away if I restart my computer, but it does come back several hours later. i have uninstalled and reinstalled mc, but it doesnt fix it. also, the esc screen wont pop up but my cursor does. this started in 1.16.2 but carries over to other versions as well. I would also like to stress that when i first played for a while this was not an issue