help with glmer

Hi,
model1=glmer(survival~size+CON+HET+INT+(1+size|species)+(1|quadrat),offset=time,data=data,family=binomial(link="cloglog"),verbose=T)

survival- dead (1), alive(0)
size - sapling, juvenile and adult categories
HET and CON  - Heterospecific and conspecific negative densitites at 20m
radius
(summ of basal area around 20 m radius of a focal tree)
INT - Census interval
quadrat - 100 number - 10x10m
time - log transformed number of years

this is the warning message at the model summary

Warning messages:1: In (function (fn, par, lower = rep.int(-Inf, n),
upper = rep.int(Inf,  :  failure to converge in 10000 evaluations2: In
checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv,  :
unable to evaluate scaled gradient3: In checkConv(attr(opt, "derivs"),
opt$par, ctrl = control$checkConv,  :  Model failed to converge:
degenerate  Hessian with 1 negative eigenvalues


my question is - how heterospecific and conspecific desnity influence
survival of sapling, juvenile and adult trees?