I have got RB951Ui 2HnD and Mikrotik holds few seconds up and then reboots, especially when I connect through cable or wifi. Screen of logs is in attachment. Do you know what can cause rebooting and how to solve this issue?
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12V adaper is just fine for your RB ... if it can supply at least 0.6A.
The problem is that power adapters tend to age (mostly because capacitors loose capacity due to various reasons) and their max current deteriorates. To a point when device wants to draw higher current than power adapter is capable of and thus voltage drops ... below the minimum acceptable supply voltage which is 9V for your RB. Such adapter will output rated voltage (or only slightly below) when not loaded ... testing it using V-meter when device is not connected is thus useless (and misleading).