The way the game normally works is that buzz rating stays at whatever point it is when you exit your cafe. However, there is yet another glitch now which has nothing to do with the layout of your cafe or whether your waiters can get to all the food on your counters or not.
You're going to have to ride this one out until Zynga fixes the problem, there is nothing anyone can do. Just wanted to throw that out there because of the hits my blog is receiving for buzz rating issues that I have posted in the past.
PS: One more thing: YES, this current situation is one of a seemingly endless line of glitches with Zynga's Cafe World game. If you leave your cafe at 105 and come back to find it at 4 or 5 or whatever much lower number, you are not alone! Many players are experiencing this glitch! Why doesn't it affect ALL players? As with almost all glitches with Cafe World, the glitches affect one or more servers, but not all of them (usually, anyway). I have no idea how many servers are used by Zynga for this game, but there are undoubtedly a large bank of them. Not all servers are affected by these glitches, hence, not all players experience the glitch. I added this comment to this thread but decided to post it in the thread itself.
past. Further Update: Zynga has officially announced it knowledge of the problem and is "working to fix it": The Wedding Table is causing my Buzz to drop
Updated 01/22/2012 at 05:41
Greetings chef,
A small number of our fellow chefs are reporting that after placing the Wedding Table into their cafe, the Buzz rating drops. As a temporary workaround, may we suggest that you place the table back into your inventory.
Meanwhile, we have notified our engineering department and they are currently working on a fix. We hope to have this resolved shortly. There is no need to submit an email for this issue. Instead, click the Please Fix button below to help us keep track of the number of players affected.
If you decide to report a ticket, place the keywords "Wedding Buzz" at the start of your message and reference: CAFE-26287.
For immediate support and the most up-to-date information, click here to visit our Technical Support Forums.
Thanks for your patience and understanding.
A small number of our fellow chefs are reporting that after placing the Wedding Table into their cafe, the Buzz rating drops. As a temporary workaround, may we suggest that you place the table back into your inventory.
Meanwhile, we have notified our engineering department and they are currently working on a fix. We hope to have this resolved shortly. There is no need to submit an email for this issue. Instead, click the Please Fix button below to help us keep track of the number of players affected.
If you decide to report a ticket, place the keywords "Wedding Buzz" at the start of your message and reference: CAFE-26287.
For immediate support and the most up-to-date information, click here to visit our Technical Support Forums.
Thanks for your patience and understanding.
.........I somehow doub it's a "small" number of chefs, but whatever the case, at least they know about it and hopefully will have a fix for it soon.