Sunday sales have been fluctuating recently and tapering off. I’m thinking of closing Sundays for a while and may revisit opening back up at a later date. Does that sound reasonable?

I think businesses that keep changing their hours are just shooting themselves in the foot. Once you close on any given day, your customers and the community are used to you being closed. If and when you try later to open, folks are used to you being closed and it is very difficult to build it back up. If your sales are slumping, then create a great promotion to build that Sunday shift back up.