We highly recommend using BlackVue microSD cards for optimal performance. The reason for it is that dashcams put microSD cards under higher stress than most electronic products such as action cameras or DSLRs due to their constant recording. We test our cards extensively before selecting them for inclusion in our products, to make sure that their performance is good and degrades as little as possible over time. We cannot guarantee the perfect performance of cards from other manufacturers, as even cards with the same specifications may vary from batch to batch. Especially the SanDisk microSD cards, which show more restarting and stability issues in BlackVue dashcams.