My first thought is that poops tend to get "jostled out" with activity or excitement. So, for example, if you calmly take puppy outside, he doesn't go, and then you come inside for a play session, he's very likely to surprise you (and himself) with an indoor poop.
Does this sound like a possibility? At this age, he really has no control over his bowel movements, but you can trigger them by jogging to his toilet spot.
If the circumstances of these accidents aren't obvious to you, try quickly jotting down his schedule for a few days, making note of the times he toilets (inside and outside), plays, eats, and sleeps. You might quickly see a pattern to the accidents that will help you troubleshoot.
I'd also recommend leashing and accompanying him rather than leaving him on the balcony. As soon as he starts going, use your potty cue, such as "Hurry Up!" And the moment he's done, reward him with great enthusiasm. If you're not there to praise him and give him a treat, how does he know he's doing a wonderful thing?
If he's not gone within a few minutes, it's back inside to a confined area and then try again in 30 minutes or so.
Does this sound like a possibility? At this age, he really has no control over his bowel movements, but you can trigger them by jogging to his toilet spot.
If the circumstances of these accidents aren't obvious to you, try quickly jotting down his schedule for a few days, making note of the times he toilets (inside and outside), plays, eats, and sleeps. You might quickly see a pattern to the accidents that will help you troubleshoot.
I'd also recommend leashing and accompanying him rather than leaving him on the balcony. As soon as he starts going, use your potty cue, such as "Hurry Up!" And the moment he's done, reward him with great enthusiasm. If you're not there to praise him and give him a treat, how does he know he's doing a wonderful thing?
If he's not gone within a few minutes, it's back inside to a confined area and then try again in 30 minutes or so.