I still get checks twice a month. Usually, they arrive on the 3rd and 18th of each month. As you are probably aware, they do send multiple checks early at the end of the year.
Recently, I have received checks for shops performed after what I consider their cutoff dates - the 1st and 15th of each month. I'm not certain how that happens.
As I have said in other strings related to this, upon receiving my check, I review my worksheet to verify the shops for which I've been paid. I do note the dates for those shops as a matter of personal bookkeeping. That is how I arrived at my own conclusion of cutoff dates. Any shops not paid for are separated from the "paid for" shops. If I find that I've not been paid for a shop within the time frame of the check, I'll do some research of why (forgot to invoice, on hold, etc) and red flag the shop. If the shop is not paid for in the next check, I call and ask to talk to Frances in accounting or someone else in that capacity.