On the Hoof bistro in Sydenham is now not open for dinner - just breakfast, lunch, coffee, tea etc but is open throughout the day. They appear to be a thriving business.
In my opinion, consistency is key in any business. Where a business changes in any way,if customers are told and given reasons, and there is only an occasional change, the damage if any is minimal. However, constant chopping and changing rings alarm bells and leads people to believe something is amiss.
With the Perry Vale there were many changes in a relatively short time in chefs, management and staff as well as in opening times.