booking has 6 hour block

As of last week this plugin was working great and we were considering purchasing the pro version. This week the plugin has suddenly become faulty. From the customer side on our website- when they try to book an appointment for the current day, the calendar is blocking appointments for 6 hours! For example, we start accepting appointments at 8:00am. If a customer visits our website at 8:00am the calendar shows that the soonest available time to book is 15:00pm. The calendar does show that appointments for the following days are available at the correct times. We have not made any changes to our plugin or out website. The booking system worked fine on Saturday (March 24). We noticed this problem yesterday Monday (March 26) and is still happening as of today Tuesday (March 27). We have the latest version 2.0
Please help or advise immediately as we are losing business and will have to find another plugin to suit our needs and we would really like to stay with and purchase Salon Booking as it has been absolutely wonderful until this mishap.
Thank you