All normal operating issues for boats. All those issues are compounded by the BVI charter environment. The BVI boats and electronics are exposed to salt and heat 24/7/365 in some cases for years with limited fresh water to clear the salts daily. Many of the boats are used far more than any were ever designed to be used. Some boats are designed, built, and outfitted more to be sold to the inexperienced budget buyers at the boat shows. Not all boats in the charter boats are created equal not even close. Same with the operators. Age of the weak boats and weakly outfitted boats will make a big difference. Even when everything is done well. Small critters even a single squid can stop the AC cooling pumps in their tracks. In your case previous salt water intrusion corroding inferior wiring terminals could have caused all of this along with many more options. None of those issues have anything to do with the core equipment of standing rigging, sails, or steering. Reality those are all normal nuisance issues on many boats. Understanding the fresh water system and some basic troubleshooting ability are good life skills to have. If you are going to rent a boat with AC. Make sure you understand where the cooling pump water is supposed to exit and understand how to clear those lines yourself when it does not. Never be in a rush to get away from the dock, always run all those systems yourself at the dock before you leave, never be in a rush to get away from the dock. In this case none of these issues have anything to do with the vessel itself. All these issues are bolt on nice to have features that are not a part of the design or vessel engineering. The better operators and better boats have redundant fresh water pumps.