Car: Polo TDI 2004 1.4 with 190,000 km (118,060 miles) on the clock. While
Issue: driving it intermittently (distance/time are not factors it seems) it starts to spew black/dark grey smoke and all power is lost (feels like the turbo has turned off). If I turn the car off and immediately turn it on, it will not start - sounds very much like when it isn't turning over if the battery is dead. If I leave it for a few minutes I can start it without a problem and it drives fine.
Factors: Distance & time are not a factor, as I can sometimes get further and sometimes not before it starts happening. It seems more likely to happen in traffic situations, so stop/start driving. There are NO engine warning lights and the heat indicator is stable in the middle (so not over heating according to the indicator).
History: Turbo was replaced 40,000km (24,854 miles) ago and hasn't had an issue at all. Recently had some electrical issues with the fuses and cooling fan not working. Both of those are resolved, however before they did, the car did over heat twice and damaged a pipe leading to the turbo which caused the turbo to lose pressure. That pipe has also been fixed and a everything in the turbo is 100% when the pressure tests were done.
Any ideas what the cause can be?