Zabbix active item: works on client but not on server

[Metrokot]

Hello.

Got UserParameters:

UserParameter=devices.adaptec.raid.controller.temperature,C:\zabbix\agent\bin\adptc_rdcntl_get_param s.cmd AD null "Temperature"
UserParameter=devices.adaptec.raid.controller.status,C:\zabbix\agent\bin\adptc_rdcntl_get_params.cmd AD null "Controller Status"

When do:

zabbix_agentd -c "C:\zabbix\agent\zabbix_agentd.conf" --test "devices.adaptec.raid.controller.temperature"

(path to conf is correct)

getting

devices.adaptec.raid.controller.temperature [t|54]

and this is fine.

It is also OK when running script (or directly exe) manually.
Executing time is less than one second.

But on Zabbix server after some time working normally these items becoming status "Not supported (timeout while executing)".

Not helping:
- restarting zabbix agent;
- restrting zabbix server;
- turning items off and on;
- changing "not supported" retest time in administration section.

Helping for some time:
- restarting server where problem items located; after some time problems return.

Zabbix agent log is clean (no problems).

I'm confused. Where to look?

[Metrokot]

Well,
error seems to be gone after fixing storage error on client. These were two completely separated problems to me and I do not know how they are connected (but it seems like they are)