The reason Target fail detected indicates a software crash but to know the exact reason we would need to extract dram dump from the AP. The dram dump can be taken from AP shell and hence restricted to Ruckus support. Kindly open a case with Ruckus support to collect the logs and provide a resolution.
We are having this same issue. We have 15 - 20 AP in the field and we seen this 3 times in the last 4 months. We discovered if you change the AP (master to slave) and back it seems to fix this issue temporarily. If that doesn't work you need to reset the AP and start over. R310 Unleashed 126.96.36.199.312 / ICX7150 -C12P 08.0.80bT213
Kindly open a case with Ruckus support as to identify the root cause for target fail "dram dump" needs to be taken from the problematic AP. Once these logs are collected then root cause would be found.
The case#00877649 was closed as no contact since there was no response on the case. We will open a new case and and engineer would assist you ahead, also I would suggest to upgrade the Unleash network to the latest available version which is 200.7 and monitor the behavior. Below is the image for R310 Unleash AP.