Continual Running of Waeco CR110 frdige over long periods of hot weather

Just went away for a weekend in van and found our smartcharger was continually running below float level for most of the times the generator was going. On previous occassions , most it seeemed to take to bring 110ah deep cycle back up was usually 3 hrs,from overnight use. Leading up to this trip the fridge had been continually going since just before Xmas(wife was helping daughter while she was waiting to have twins) and a lot of that time was in extremeley hot weather. On the 2nd day out after running gennie for 8 to 10 hrs , the charger finally got ahead of the fridge. Leading up to that i had noticed the compressor running for long perods of time. when got home disconnected battery and put on 6amp charger to check battery. Once battery had reached float level i disconnected to check on "leakage" and found that battery overnight had dropped from 13.45v down to 13.33v.........What I am trying to work out is what is the more likely cause, the fridge, or the battery(12mths old reasonable use) Had covered the terminals at one stage with petroleum jelly, which appeared to have broken down after a while. After cleaning terminals and connections etc it did improve for a while.

Sorry if confusing, but thought best to list everything

any help /advice greatly appreciated