Please read this post
for instructions on getting detailed information to Waze to troubleshoot this known issue.
I"ve seen a few posts about this, but NO SOLUTIONS! Every couple of days all my search engines disappear and I only have contacts there. This means I can not find any addresses, even if I know them and put them in specifically (Can't even find the White House and I live in DC). The only solution I have is to delete the app and reinstall. This is NOT a long term plan for me, I love Waze, but not that much. will be moving to another navigator in the next week if they don't fix this.
iphone 5 user.