I haven't had any further issues with mine rebooting for quite some time now. However, what I am going to relate now may be nothing more than sheer coincidence but thought I would mention it.
My BT HH has a habit of suddenly going off line for no apparent reason. The hub lights turn green, then sometimes amber followed by red. This lasts not but a couple of minutes at the most before normal service is resumed.
The last twice that the 1000s reset itself was at the same time the HH went offline. I know because I was checking the logs on the HH. Whether other reboots of the 1000s coincided with a HH reboot I couldn't say as I didn't pay attention to the times and dates.
As I say, it may be nothing but it is an odd coincidence.