Device unresponsive after running automations

[oribenzvi]

When we are running test automations on multiple devices, the first minutes seems fine, but after a while or when i'm stopping the tests manually, all the devices becomes unresponsive - can't perform any actions on them, can't even stop using them or pressing stop button.

Logs from stf:
Until here all the devices working perfectly, the automation is running, usual logs (until the error occurs - after a while or when I'm stopping the tests manually, with the exception attached, and then spamming 'Waiting for boot to complete')

2021-04-08T16:02:39.088Z INF/device:plugins:group 27121 [""] Unsubscribing from group channel "[""]"
2021-04-08T16:02:39.238Z IMP/device:plugins:group 27111 ["************"] No longer owned by "user@mail.com"
Unhandled rejection TimeoutError: operation timed out
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5)
From previous event:
at EventEmitter.plugin.releaseWakeLock (/usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/service.js:472:10)
at EventEmitter. (/usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/group.js:111:15)
at emitOne (events.js:121:20)
at EventEmitter.emit (events.js:211:7)
at /usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/group.js:95:18
From previous event:
at EventEmitter.plugin.leave (/usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/group.js:78:10)
at /usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/group.js:153:27
at runCallback (timers.js:810:20)
at tryOnImmediate (timers.js:768:5)
at processImmediate [as _immediateCallback] (timers.js:745:5)
From previous event:
at Router. (/usr/lib/node_modules/@devicefarmer/stf/lib/units/device/plugins/group.js:152:12)
at Router.emit (/usr/lib/node_modules/@devicefarmer/stf/node_modules/eventemitter3/index.js:118:35)
at Router. (/usr/lib/node_modules/@devicefarmer/stf/lib/wire/router.js:36:12)
at emitTwo (events.js:126:13)
at exports.Socket.emit (events.js:214:7)
at exports.Socket.Socket._flushRead (/usr/lib/node_modules/@devicefarmer/stf/node_modules/zmq/lib/index.js:638:15)
at exports.Socket.Socket._flushReads (/usr/lib/node_modules/@devicefarmer/stf/node_modules/zmq/lib/index.js:676:23)
at Object._zmq.onReadReady (/usr/lib/node_modules/@devicefarmer/stf/node_modules/zmq/lib/index.js:297:10)

2021-04-08T16:03:11.498Z INF/device:support:adb 31013 [[""]] Waiting for boot to complete
2021-04-08T16:03:11.742Z INF/device:support:adb 31021 [[""]] Waiting for boot to complete
2021-04-08T16:03:12.448Z INF/device:support:adb 31013 [[""]] Waiting for boot to complete
2021-04-08T16:03:12.743Z INF/device:support:adb 31021 [[""]] Waiting for boot to complete
2021-04-08T16:03:13.450Z INF/device:support:adb 31013 [[""]] Waiting for boot to complete
2021-04-08T16:03:13.744Z INF/device:support:adb 31021 [[""]] Waiting for boot to complete

Attached photos:
First - devices stuck at 'stop automation' state - unresponsive
Second - Device state - unresponsive
Third - devices stuck at 'stop using' state - unresponsive
Fourth - chrome developer options console showing error while pressing device home button

The log keeps printing the same error massages, nothing works until we restart the stf service, pls help, Thanks!