Yes and no.
Reliable in a sense that they rarely have minor issues (such as this). But when they fail - they take the entire fuel system with them, and its an expensive repair.
I can only add to what others have mentioned, its almost certainly a fuel related issue, in not getting enough fuel to the pump, something which you should be concerned about as the high pressure Bosch pump is lubricated by fuel, and if it isn't getting enough its likely to have that aforementioned catastrophic failure.