Solutions
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TheFriedchicken's post in Error in LCPD was marked as the answerOk checking out the mods i found that the Car mods and the Ped mods made the img files too large causing the game to run out of memory quickly. LCPDFR has very little errors when using Vanilla vehicles. It would be best to look around lcpdfr.com to see if there are any els vehicles which don't crash the game every 20 mins.
My advise if the game is unstable using the Met mod then try and only mod one vehicle this seems to be ok so far, but does not match the theme haha.