Yes this is a problem I have if I crash deep in the window.
How to avoid this. You have to spot it befor it happens.
How I launch my GP, if I'm launching to the left, I pull the right side till it drifts back in the window and flips, then pull the left to get it in the air.
If you do this on the 15 the bridle will wrap around the tip.
As you see the kite drifting back and you see the bridle go behind the tip, pull the steering line that it's going to wrap to get the line off it, then launch. If it wants to keep going back hehind the tip, get it in front and pull the front lines till its ready to launch

I'm not sure if this makes sence but if you play around and not try and launch it as fast as you can this won't happen again. Although it happened to me yesterday on a self launch.

Other then that it's a really good kite.

If you want a little more pressure and choke on the lighter days tie a 4th knot on the wing tips, works a treat.

As kemp says spot it early.

Generally I blow/flag the kite off (if possible) as soon as I see it. If this doesn't fix it (for me maybe 10%) then I'll let it get powered whilst still caught and do the next 2 steps very fast.

1) As the kite starts its deathloop (better to be a little airborne, no contact with water) give the bar a quick hard pull and push away, cannot be overstated how hard and fast. Do it as though your life depended on it. This makes my kites sort off pop in mid air, this releases the snag about 50% of the time. Now if this fails quickly to 2.
2) Blow off the kite again, reset safety and fly away. Never had this not work after step 1 as long as the kite gets back into the air a little.

Can only think of one time when wind, tide and the position in the window, didn't allow the kite to get a little air. No separation from the surface makes my kites fall back into the same problem again. Self rescue and start again.