Peripheral crashes when running a program on multiple turtles at the same time

So I am designing a turtle chess game on a server. Both my client and the server run Computercraft 1.63, and there are no other mods installed on the server side.

All 32 turtles use the same program, which when a specific packet is received will restart. If I restart the turtles one-by-one, it all works fine, but when I restart them all at the same time, about 10 - 15 (never the same ones) turtles crash with the same error
peripheral:45: No such method isPresentRemote

I checked the peripheral API at line 45 and it says:

if native.call(sSide, "isPresentRemote", _sSide) then

Code: http://pastebin.com/jbxfxecj

Note: I had to do turtle.equipLeft twice because I found a bug where it doesn't find the modem on my turtles.

Well that's most odd, and would strongly suggest the problem's within ComputerCraft itself - the issue is that it's mis-identifying the type of modem you're using, leading it to attempt to call a function only available to the wired model.

Assuming it's related to one (some?) of ComputerCraft's previously reported bugs, I'd suggest starting your script off with a one-second sleep instead of the turtle.equipLeft() business. With any luck that'll do the trick.

The turtle.equipLeft business has got to do with another error where it would not find the modem, but thanks for the help.

Edit: It worked! Thanks!

To be clear, I was expecting the sleep to affect both issues, given that they're related.