I've seen similar-ish wifi connectivity issues on 5.8.0-6.2.0. Though it seems as if it may be a little better on 6.2.0, I still see frequent disconnects. In the past 6 days I've seen 233 cloud re connections (at least going off of spark/status: online).
Result
count 233
mean 00:30:00.09
std 01:09:54.17
min 00:00:00.07
25% 00:02:48.39
50% 00:07:46.06
75% 00:21:33.81
max 08:24:43.12
For the cloud of spark/device/diagnostics/update
"connection":{
"status":"connected"
"error":-220
"attempts":5
"disconnects":5
"disconnect_reason":"error"
}
Do you see the same disconnect error in the console/log? I don't mean to hijack the thread but think your issue is similar to mine.