think you found the problem but any cube will work, of course apple wants you to buy theirs but we use any one , also those phones are disappearing but you can get that type of cable at dollarrama but with anything wired they do break a lot, haven't had a phone cord yet that outlasted the phone lol dirt and stuff can be hard on them too but if you do need another cord, i still have in the junk drawer i could get to you