As per your question, I (IndexOfDownload) want to make you sure that any android phone can hang at any particular instant. IPhones generally don’t hang because their hardware and software both are manufactured by Apple whereas generally android phones have hardware and software manufactured by different companies. That is why there are always compatibility issues.
Nevertheless OP5 is a great phone with latest flagship processor SD835. So chances of hanging are quite low but u can’t say it won’t hang at any given time.