#330 irsend in irexec unreliable

[Balint Kozma]

I have an Irdroid USB connected to a Raspberry Pi model 3B., running lirc 0.9.4.c and 0.10.1 tried too.
I would like to use my tv remote controller to control my amplifiers volume level. To achieve this I put irsend commands to irexec. My observation is that irsend send the signal on about every third button press. Looking at it with irw, it prints the button press event only when the irsend works. But when I put only echo commands to irexec, it works perfectly. It might be a race condition or locking problem between irexec and irsend? Is there a workaround for this, or a fix needed?