I've been setting up my new lawnbott and it has been a slow, miserable experience. I have a lot of slopes in my yard and that was why I picked the lawnbott, it allegedly can do steeper slopes than the robomower. Last night I finally finished with laying the perimeter wire down and put the bot in the charging station to charge up. I got up this morning figuring I'd start the lawnbott for the first time. I was surprised to see that it had taken off on its own. It had marched across the yard and then stopped. I examined the situation and saw that it had cut the perimeter wire. I repaired the wire, pegged it down well, and then restarted the bott. This time it followed the perimeter wire and all went well until it hit a bit of a down slope that caused it to shoot past the perimeter wire. It backed up, went forward, backed up, and so forth until -- snap! -- it cut the perimeter wire again. I realized that it's not the blade that cut the wire -- the cogs in the gear-like rear wheels snapped the wire with all the back and forth stuff. I fixed the wire again and buried that section of it. I started the bot again and this time rather than follow the perimeter wire it shot straight across the yard until it hit the perimeter, again on a down slope. It did its back and forth stuff again and snapped the wire again.
My conclusion -- every part of the perimeter wire where the ground slopes down in the direction towards the outside of the lawn must be buried. Otherwise the bott will chew it up like an angry dog.
