Yep, the banjo bolt or maybe a failing over pressure sensor on the intake manifold. Clean both.

If it fails regularly enough, you could try bypassing the overpressure relief valve on the firewall near the brake booster. If this solves your problem, then I'd replace the pressure sensor (assuming you already cleaned the banjo bolt and pressure line on the very back of the intake manifold.

It could also be a sticking waste gate but the above are more likely.

Best Wishes,
Bruce