That's because the SMR-945U is a LTE version and its included in the beta at the moment
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Thank you for your feedback along with apologies for such poor experience with your rebooting issue (Yes we are aware of this issue unfortunately).
As suggested by @GaryB82, resetting is the temporary solution as of now to resolve this issue.
For those of you who could not participate in this Beta (i.e. SM-R945U model), we are only conducting Beta to BT models only (SM-R940,R930,R950,R960) to ensure better software stability.
For any other issues, please report the issues back to us via Galaxy Wearable app > Contact us > Error Report.
