I tried to send once a higher number of transactions (+30) in a few minutes to different addreses, and the starting recommended fees were about $0.15 for the first one. I sent the first and having that number in my head, I kept sending to other addresses without ever looking again at the fees.. only to find out at the 11th transaction that the fees just kept getting higher and higher, so the last one did cost $0.94 in terms of fees. Looking at all the transactions in a row the fees were like $0.15 for the first, $0.19 for the second, $0.24 for the third and so on until I reached that sum. Then I sent the next ones by choosing my own wanted transaction fee, which was $0.20 for each. They got confirmed in a few dozens of minutes..

Whenever you send a transaction, double check the fees. $4 for your small transaction is too much.. just put $0.2 like I always do, and you should be doing fine.