I am very careful with my bitcoins. I do make sure that the wallet of my bitcoin is secured, that I can always access it and easily recover it in case of some problems. But some of my coins are in myether wallet which I have not opened for a long time. I still have my private key but myether wallet took a lot of upgrade in since the time I last opened my account as well as my kucoin account. I tried to retrieve it all and luckily after few days of confirmation, I opened it and get back coins.