No, that's not normal behavior.
Are you using the phone with a PoE (Power over Ethernet) switch or injector, instead of using the wall-wart DC power supply? I was having very frequent reboots on my 1032 phone, using a PoE injector, until I replaced it... bad power supply.
If you are using PoE, try using the wall wart power supply instead. If you are using the power supply, then open a support ticket with Obihai.