The 'solution' is to change your gameplay options or build a relay network. If the craft is a probe with no direct comms link to KSC, this can occur. The solution would involve understanding why this occurs and preventing it happening in the first place. Exit non-essential programs (Anti Virus, Firewall incl. Well, no, thats not a solution but a workaround. Try to re-register the key in the KSP settings (KSP is not registering that I press the shift key) My shift keys are not funtioning inside KSP! (As you can imagine, only being able to decrease throttle (L-Ctrl) and not increase (L-Shift) throttle leads to dead Kerbals ) I've got this very strange problem with key mappings inside KSP.