Hi Rado,
How many templates are cleared from the Cache when you do this action in SITSPMON? Perhap's take note of the templates that you clear and then see what templates are added to the cache again when the service work's on the WaveLink handheld device?
Could it be the case that the template cache is not large enough?
See the SAP NOTE
862162 Integrated ITS, No more HtmlPP-slots; rolling out LRU
Regards.
Oisín