Just got affected twice today, and wasted a couple thousand energy.. What would be good to have a user set alert (user choose how many XP before ranking up the alert comes up), and the user then gets a msg coming up so he can "slow down" and remove relays/weapons/ spend in Base/etc.. before levelling up

Or you could just pay more attention

Fool me once, shame on you. Fool me twice...

Hovering over your XP bar will tell you what's left before leveling. You'll just need to watch it a bit closer or risk learning this lesson the hard way. Again.