Blade 15 and Mamba Wireless (2018) Keyboard Inputs Corrupted when Connected Via Bluetooth

Hi As the description says I have a Blade 15 (4K) and Mamba Wireless that was purchased at the same time, about 3 months ago. It was literally a product suggestion on checkout. Since the first time connecting the two, whenever the mouse is connected via Bluetooth the keyboard inputs on the laptop would glitch as if using a different input set. For example letter inputs are replaced with diacritic variants (https://en.wikipedia.org/wiki/Diacritic) and even functional keys like Esc stop working. Once in this state the only way to fix the machine is with a hard reboot - if the Bluetooth is just disconnected or switched off or the mice connected by cable the problem persists. The problem does not occur if the mouse is connected by cable in the first instance on boot up - which is presently my forced workaround. Recent Synapse updates have not solved the problem, nor has deleting drivers from device manager, uninstalling and reinstalling synapse etc. Anyone else experienced this issue or know of a fix? Would really like to be able to use my Wireless mouse as intended.