Frontier Communications Corp. ( FTR) is down 34.1% year to date. Its biggest problem has been lack of investor confidence that the company will be able to continue paying its famously high dividend yield, which has swelled to nearly 20% as the share price has dived. The stock closed at $2.14 on Friday, up about 0.5% and in a 52-week range of $1.92 to $5.75.