With profits policies cannot fall unless a market value adjustment is being applied. Some of the profits are also held back in the form of terminal bonuses which will kick in at the end of the policy. If you cash in, you will lose under both, and those that stay will get your benefits (minus charges). You need to get the policy reviewed and obtain details on charges, commissions, MVA, terminal bonus etc.
You may be able to just make it paid up and wait until maturity.
Eagle star with profits policy is the only one to my knowledge never to have implemented a market value adjustment.