Bug in 1.7.7.3 - on the first page of the online store, the prices on all displayed products randomly disappear

[franci]

After new installation of 1.7.7.3 I see that on first page web shop through day randomly disappear prices on showing products. I had no idea why and how to solve the problem.  Then I go to advanced setting  - performance and clear the cache. And you can not believe the price on first page of web shop come back?!!!   But this still make me crazy and make us to losing the customers because after some time  the prices disappear again and  I have to check again and again to clear the cache..... ?!! Stupid!!!

Does anyone have the same problem or solved this kind of problem? Does new version of 1.7.7.4 will solve that? 

Thank you for help... Franci