The issue mainly is the voltage regulator cannot keep up with 2 solenoids. The voltage drops low causing solenoid performance and then the chip goes into brown out causing a reboot.
I'm personally not impressed by any Tadao hardware. Seen several older Matrix'es that had problems, seen Angels have to send boards back to get replacements ( very good service though). Only person I know using one in his DMC has to run Liithium 9V's to make it through more than two cases of paint.
If I was buying would look into the Tagsportz Predator line. Curt is an incredible designer and programmer.