This is perhaps off topic but I always leave my X running while fiddling with the diagnostics since the battery really can't offer enough current for long enough to successfully complete most desired tasks. In 8 months I've had zero issues using this method. Perhaps the problem you're having with certain modules is linked to battery charge? If not, you might also consider switching from NORMAL to ENHANCED in the settings (comms section) and also slowing the rate of transfer (there is also an available option for this) which according to the programmers has been know to improve communication in some instances.