TanninShannon

I am having alot of trouble trying to figure out this tanning bed. it works good during the day until its being used back to back. after about the 4th session, the bed shuts down early, the client gets out and starts dressing, and then turns on a again to finish the session. it just keeps doing it over and over again. ive checked the ventilation.. it seems to be good and ive checked the fans under the lounge. and every thing seems to be ok. although.. ill be honest, i dont really know what im looking for or what the fans and ac are supposed to look like while they are running. Do you think i need more air circulating in the room? its a big room for the bed... but thats the only thing i can come up with. or any ideas what else it could be?
any help would be great.
thank you