Cheers mate i've sent way over over the ampunt in the past tears and never had this,,,,,,i will have a look in preferences or simialer.
In the past it was even possible to get zero-fee transactions to confirm as the network didn't have this much activity. Currently the network is congested. You can see the information required here:
https://bitcoinfees.21.co/
That will show you the number of unconfirmed/confirmed TXs in each fee-rate range and the recommended TX fee (end of page).