Trusted allies in 1.02

[Sheogorath]

Ive had this problem in my Venice campaign, namely with the Portugese and Hungarians. It seems their AI's are really into the 'Blockade one port with one ship for one turn then run away and dont do anything for the next decade or so.'
The odd bit is that they were both my best allies. I'd been allied to Hungary for nearly a hundred turns, and the only person I had declared war on was Milan (With just cause to, the bastards were using my Venice province as an army staging ground >_>) via Crusade.
Meanwhile, my vaults are full of a million or so florins and I'm wiping the floor with the Byzantines and Sicilians.
Suddenly, the Portugese come out of NOWHERE and blockade Genoa for one turn. Then the Hungarians blockaded Constantinople for one turn.
Ten turns later, a Hungarian stack shows up at Constantinople and gets its ass kicked.
I signed peace treaties with both of them (Very good terms for me and still 'Very Generous') and two turns later, theyre back at it!

About as logical as a tree full of monkeys on LSD.