Zones 7 and 8 on an 862 panel can only be programmed as "24-hour" type zones, hence why the alarm triggered without being armed. You need to work out what is connected to zone 8. It will most likely be the panel tamper and/or the siren cover tamper switches. My guess is the siren tamper. The best solution is to call a licensed alarm technician out and have them change the siren tamper switch, as it is probably the old "plunger-style" switch, which is known to cause problems after a few years. Make sure they change it to a "reed-style" switch, which is much more reliable.
If you call someone out and they recommend to disconnect the tamper switch without changing it, thank them and send them on their way (your choice if you pay them or not) - I don't see the point in lowering your security level when the problem can be easily fixed.
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