I have sent BTC yesterday but one day passed it is not confirmed, I have raised mining fee, this sucks.
Yes this is a recurring problem, the bigger the transaction so that it becomes slow, I worry if the user continues to increase and the bigger the bitcoin transactions but could fail.
Problems with the time of transactions with bitcoin happen, but this is not a reason to panic and assume that bitcoin can die. The software bitcoin is constantly being improved, a good team of specialists is puzzling over it, therefore, we all hope that the problem of the speed of transactions will soon be resolved.