sensors acpitz-virtual-0 temp3 after standby at 100.0°C

sensors acpitz-virtual-0 temp3 after standby at 100.0°C

"sensors" will report 100.0°C on acpitz temp3 after standby mode. This temperature does not change any more. All other temperatures of acpitz module (and coretemp) will show suitable values and will change while laptop keeps running. Only temp3 will stay at 100.0°C.
If I do a reboot all temps, incl. temp3 seems to be correct. Problem always occurs after laptop was in standby mode.
How can I force / initialize an reset / update of temperatures or set that temp manually? Is there another way to read temperatures to check them?
-- running ubuntu 13.04 on Compaq 610
-- output of sensors (after reboot)
$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +43.0°C  (crit = +105.0°C)
temp2:        +25.0°C  (crit = +107.0°C)
temp3:        +45.0°C  (crit = +110.0°C)
temp4:        +49.0°C  (crit = +256.0°C)
temp5:        +43.0°C  (crit = +107.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +43.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:       +45.0°C  (high = +100.0°C, crit = +100.0°C)