Some expats go crazy over a period of time and a lot of it can be prevented by regular trips to a home country. The disconnect from people they normally socialise with etc. can have a major impact without some people realising. They can appear aggressive on a regular basis, they suffer with a lack of sleep and a general annoyance of Philippines life.
It simply means they just need a break from life in the Philippines as it has become too much for them.
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