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I normally don't do this, but yesterday I turned on my HD500 before my DT25H had fully gone through all of its startup routine. (I run the two connected via L6 LINK.) When I tried to play, I couldn't get and sound out of it. I noticed that my amp was locked with all four voicing lights lit. In standby I disconnected the L6 LINK and tried slowly flipping all manner of switches. At one point I had none of the voicing lights lit, and at another point I saw the amp retardedly responding to my command to change voices. I slowly turned it off and on a couple times, tried LPM, but nothing would produce any sound other than the sound that normally passes to the speakers when I flip a voice or bias switch. In desperation, I unplugged my DT25H from the wall and played another amp. This morning I tried it in LPM and it worked! The volume seemed way too low for the settings. But then after about 60 seconds of playing the volume abruptly went back up to where I'd have expected it. I put it in standby, connected my L6 LINK, turned off LPM, and tried it--and it worked normally! So I'm happy it's working, and from now on I'll be VERY careful to not boot both devices at the same time. However, I'm worried that this problem may still somehow return despite my best efforts. Has anyone else experienced this, and is there any knowledge base or consensus about what the heck is going wrong? THANKS! **** EDIT / ADDITION **** 10/14/16 **** Oh no, it happened again. This time I was careful to follow my routine, which has been to turn on the DT25 first and wait until it has time to fully load and change the settings to whatever it was last set for. Then I turned on my HD500 (connected via L6 LINK). Then I got no sound. The amp's panel showed no voice selected (lit) and no bias selected. I shut it down, pulled the plug, went through the same paces and it worked. **** EDIT / ADDITION **** 10/15/16 **** Well, this is an ongoing thing now. FYI, with power to the HD500 off, the DT should not see it, and the L6 LINK should be invisible as well, correct? So I first threw the power switch (still in standby) and watched carefully as all switchable lights flickered on then off within a fraction of a second. And they stayed off. I threw the power switch back off, unplugged my amp, plugged it back in, tried it again, and this time all switchable lights came on and stayed on. ("all switchable lights" includes all 4 voice lights, both chnl A & B lights, both triode and pentode lights, and both the class A and class AB lights--i.e. every single light that can be in either on or off state when power is applied.) I tried it a 3rd time and it operated normally (I think): All lights came on, then a few seconds later only 1 light per switch was illuminated. I turned on my HD500 and played as normal. Following suggestion here, I am going to have my HD500 on when I turn on the DT and when I turn it off and see if this makes a difference. I will not change any settings on the POD unless the amp is also on. **** EDIT / ADDITION **** 10/14/16 ****