I have just bought 4 SGE switches. SGE2000, SGE2000P, SGE2010 and SGE2010P. I’m trying to connect them in a stack but it does not work. It is possible to connect SGE2010 and SGE2010P in a stack but the other models (SGE2000, SGE2000P) will not connect. I have reset all switches to default and connected the switches in a ring. The 24 ports units has been connected to port 12 and 24 and the 48 ports units has been connected to port 24 and 48The units seem to take the right please in the stack but the 48 units end up with light in all lambs.