I've encountered a problem my last two races when I attempted to switch my tire strategy mid-race. In both cases, the crew did not put on the tires I requested, instead opting for the strategy laid out in the pre-race planner. The most recent one of these happened in our league's Japan race. It started to rain after the first round of stops, and I attempted to manually bring my driver in for a set of inters. Instead, my car first drove past the pit lane (I don't remember exactly when I hit the pit button, so that one may be on me), then came in on the next lap and stuck on another set of soft tires.
The kicker is when I had to bring him in again, I switched my request from inters to full wets very late in the lap. This request went through fine. Perhaps this is a consequence of the intermittent connection issues that have been cropping up, but it seems silly to give mid-race control when it's only going to work half the time. For posterity, here are the results from the Japan race.
http://igpmanager.com/play/?url=race-result/49412/26322