I also have a DG834 router, and somewhere in this discussion forum is a thread I started to say that every device on the network connects reliable except the MX200i internet radio that we use in the garden; despite a strong signal the connection would drop with regular monotony.
The likely cause explained to me was a WiFi chipset incompatibility and having proven that the radio streamed perfectly from the primary wireless access point in the house (a BT Home Hub v1) I have done two things; (a) of no relevance here but for completeness, modified the radio to improve antenna performance. This has allowed us to use it in the garden from the Home Hub. (b) I have purchase a second BT Home Hub from ebay for a tenner that I will use to replace the DG834 and then stick the radio antenna back inside the case (the mod I made was to take it external).