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One possibility is your Kobo's database was corrupted. Not safely ejecting before unplugging the USB cable is one of the major causes. Another possibility is that if you have a Kobo with an internal µSD card that is failing. Either of those can trigger a factory reset.
From your information, you have a 6 inch/152mm screen. There are quite a few Kobo models that have external measurements close to the 110x160mm dimensions you gave. The N249 Clara HD is the closest but several others are in the same range. The Clara BW & Clara Colour, for example, are 112x160mm
What is the model number shown by your Kobo? More => Settings => Device Information. The first 4 characters of the serial number are the model number (i.e. N249 for a Clara HD). Below Device Information in the More menu should be an About entry which also gives the name of the model (i.e. About Kobo Clara HD).
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