2004 RX330 starter battery alternator failure
 

My wife's Rx330 has about 150k miles and recently started failing in various places. First the starter gave up and stopped engaging. Replaced it, but after a little while a 2.5 year old battery also failed. Replaced it as well but decided to check up an alternator. It also failed the test, was generating about 13.3v output. So I'm going to take it out today and replaced it as well. The question I have is the following, what could have caused such a massive failure? I understand that bad alternator could cause the battery to go bad and vice verse but why the starter then? Could there be some underlying other problem? Also after I replaced the battery, the windows in the back and front passenger side stopped opening from the drivers console, but are opening from each door controls. Thank you