have NEVER adjusted the fee i years, it has always 'popped up when sending, 0.000X, being a single figure X being ?
Think i always been 0,0001 BTC ?
A fixed fee is a bad idea. The fee that is appropriate is mostly determined by two factors: 1. TX size (the size of your transaction); 2. The recommended fee-rate in satoshis/byte. For example:
TX size 300 bytes with recommended fee of 10 satoshis/byte (example) would require a fee of ~3 000 satoshis.
TX size 300 bytes with a recommended fee of 120 satoshis/byte (current) would require a fee of ~36 000 satoshis.
You should look into Multibit settings and adjust them so that the wallet includes higher fees.