What exactly is "env. mod"? This is probably the source of your problem. The TMO sensors are carefully balanced for use with its own built in environment mod. It's also possible that RSRD has altered sensors and this is causing problems with the TMO Envrionment mod as well. I don't really know, I don't use RSRD (not a fan).
Using straight TMO, I definitely don't have this problem, though there is an annoying tendency for the lock to be lost after a few seconds if the target is over a certain distance away. It's usually pretty far though. It can be worked around by just re-locking the target quickly after lock is lost. I don't know what the default keyboard control is for that, but knowing what it is for your setup makes it pretty easy to do.
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